I forgt my itune password - Apple iPad (16 GB) WiFi Tablet PC

With regard to your situation, the only way is to restore the password with iTunes or iCloud. Just follow below steps.

If you have synced your iPhone with iTunes before you forget your iPhone password, you can reset your iPhone by using iTunes without losing data. Through iTunes, you can restore your iPhone from the last backup and remove the passcode from your locked iPhone while retaining your data. If iTunes asks you to enter the passcode, try another computer. Otherwise, you have to follow the reset iPhone Passcode with Recovery Mode section below. The following steps will show you how to reset iPhone password with iTunes.
Step 1. Connect your iPhone to the computer with via a USB cable that your iPhone has trusted.
Step 2. Launch iTunes. If you've synced your iPhone with iTunes, then no "enter password" is required.
Step 3. iTunes will automatically sync your iPhone and create a backup file. If it doesn't, you should sync your iTunes and create a backup file manually by in the Summary window.
Step 4. In the Summary window, you can see the option "Restore iPhone". Click it and follow prompts to choose the latest iTunes backup to restore your iPhone.

After the restoration process is complete, your passcode will be erased and all your data will be restored from your backup. You will now be able to access your iPhone without any passcode. And you can set your new password on iPhone.

For more methods, check: How to Reset Password on iPhone

In iOS10 how to use easy way to unlock the screen
If you want to use the slide way back to unlock iPhone screen, here's the steps for you to follow.
You should check if your device meets the condition. That is, your iOS device must have Touch ID-enabled feature. Including iPhone 5S, iPad Air 2, iPad Pro, iPad Mini 3 or other later devices.

In this case, you have to reset the password. One of the methods to do that is using iTunes. Just follow below steps to reach this aim.

If you haven't synced your iPhone with iTunes before or if you haven't enabled your Find My iPhone on, you can take advantage of the third method. Resetting iPhone Password in Recovery Mode is not complicated. The steps below will show you how to do that.
Step 1. Disconnect all cables from your iPhone and turn it off.
Step 2. Press and hold the Home button and connect your device to iTunes. If your iPhone does not turn on, please turn it on manually.
Step 3. Continue holding the Home button until you see the Connect to iTunes screen. iTunes will remind you that it has detected your iPhone in recovery mode.

Step 4. Click OK. The Summary tab in iTunes appears. Click "Restore iPhone" and restore your iPhone.

Recovery Mode will erase all your data and passcode from your iPhone, resetting it to factory defaults. Thus, you'll have brand new iPhone without any personal data after you reset iPhone password with Recovery Mode. Therefore, please consider carefully whether you need to use this method to reset password on iPhone.
If you remember your current iPhone password and you just want to change into a new password, you can finish it with ease. Go to Setting > General > Touch ID > Passcode (iOS 9/8/7) or Passcode Lock (iOS 6), then enter the current password and tap Change Passcode. Then enter the new passcode. Now, you have reset your iPhone password.

For more methods, check: How to Reset Password on iPhone

It's a simple task. You can do that with iTunes or iCloud with ease. Just refer to below steps. Check:

If you have synced your iPhone with iTunes before you forget your iPhone password, you can reset your iPhone by using iTunes without losing data. Through iTunes, you can restore your iPhone from the last backup and remove the passcode from your locked iPhone while retaining your data. If iTunes asks you to enter the passcode, try another computer. Otherwise, you have to follow the reset iPhone Passcode with Recovery Mode section below. The following steps will show you how to reset iPhone password with iTunes.
Step 1. Connect your iPhone to the computer with via a USB cable that your iPhone has trusted.
Step 2. Launch iTunes. If you've synced your iPhone with iTunes, then no "enter password" is required.
Step 3. iTunes will automatically sync your iPhone and create a backup file. If it doesn't, you should sync your iTunes and create a backup file manually by in the Summary window.
Step 4. In the Summary window, you can see the option "Restore iPhone". Click it and follow prompts to choose the latest iTunes backup to restore your iPhone.

After the restoration process is complete, your passcode will be erased and all your data will be restored from your backup. You will now be able to access your iPhone without any passcode. And you can set your new password on iPhone.

For more methods, check: How to Reset Password on iPhone

As for resetting iPad password, an easy way is to utilize iTunes. Just refer to below guide.
If you have synced your iPhone with iTunes before you forget your iPhone password, you can reset your iPhone by using iTunes without losing data. Through iTunes, you can restore your iPhone from the last backup and remove the passcode from your locked iPhone while retaining your data. If iTunes asks you to enter the passcode, try another computer. Otherwise, you have to follow the reset iPhone Passcode with Recovery Mode section below. The following steps will show you how to reset iPhone password with iTunes.
Step 1. Connect your iPhone to the computer with via a USB cable that your iPhone has trusted.
Step 2. Launch iTunes. If you've synced your iPhone with iTunes, then no "enter password" is required.
Step 3. iTunes will automatically sync your iPhone and create a backup file. If it doesn't, you should sync your iTunes and create a backup file manually by in the Summary window.
Step 4. In the Summary window, you can see the option "Restore iPhone". Click it and follow prompts to choose the latest iTunes backup to restore your iPhone.

After the restoration process is complete, your passcode will be erased and all your data will be restored from your backup. You will now be able to access your iPhone without any passcode. And you can set your new password on iPhone.

For more methods, check: How to Reset Password on iPhone

If you need to reset Apple id password, just follow this support page: https://support.apple.com/en-us/HT201487

If you need to reset password on iPad, you can through iTunes or iCloud. Follow below instruction.

If you have synced your iPhone with iTunes before you forget your iPhone password, you can reset your iPhone by using iTunes without losing data. Through iTunes, you can restore your iPhone from the last backup and remove the passcode from your locked iPhone while retaining your data. If iTunes asks you to enter the passcode, try another computer. Otherwise, you have to follow the reset iPhone Passcode with Recovery Mode section below. The following steps will show you how to reset iPhone password with iTunes.
Step 1. Connect your iPhone to the computer with via a USB cable that your iPhone has trusted.
Step 2. Launch iTunes. If you've synced your iPhone with iTunes, then no "enter password" is required.
Step 3. iTunes will automatically sync your iPhone and create a backup file. If it doesn't, you should sync your iTunes and create a backup file manually by in the Summary window.
Step 4. In the Summary window, you can see the option "Restore iPhone". Click it and follow prompts to choose the latest iTunes backup to restore your iPhone.

After the restoration process is complete, your passcode will be erased and all your data will be restored from your backup. You will now be able to access your iPhone without any passcode. And you can set your new password on iPhone.

For more methods, check: How to Reset Password on iPhone

If you have synced your iPad with iTunes before you forget your password, you can reset your iPad by using iTunes without losing data. Through iTunes, you can restore your iPad from the last backup and remove the passcode from your locked tablet while retaining your data. If iTunes asks you to enter the passcode, try another computer. Otherwise, you have to follow the reset iPad Passcode with Recovery Mode section below.

Step 1. Connect your iPad to the computer with via a USB cable that your iPad has trusted.
Step 2. Launch iTunes. If you've synced your iPad with iTunes, then no "enter password" is required.
Step 3. iTunes will automatically sync your iPad and create a backup file. If it doesn't, you should sync your iTunes and create a backup file manually by in the Summary window.
Step 4. In the Summary window, you can see the option "Restore iPhone". Click it and follow prompts to choose the latest iTunes backup to restore your iPhone.

After the restoration process is complete, your passcode will be erased and all your data will be restored from your backup. You will now be able to access your iPad without any passcode. And you can set your new password on iPad.

http://www.leawo.org/tutorial/how-to-reset-password-on-iphone.html

You don't need to know your password for the iPad. As long as you know the password for your iTunes account, you used to setup the account on the iPad for. Connect the iPad with the computer and open iTunes and give in the password for the iTunes account. Apple will unlock the iPad and you can setup a new pass code for the iPad.
When you forgot your iTunes password, you have to contact Apple and prove you are the legal owner of the account.
Use this link to find more support for that:
Apple ID Support

You have to manage your iTunes account in iTunes. Follow these instructions to change account information.

You can change your Apple ID name, password, or billing information at any time.

1. Choose Store > View My Apple ID, and sign in.
   

2. Click Edit.
   

3. Make your changes, and click Done.
   

Your changes take effect immediately.

If you also use your Apple ID in other apps, you don't need to update your information in those apps. The changes you make in iTunes apply to all apps in which you use your Apple ID.

If you have an AOL account, changes you make in iTunes don't affect your AOL account on the AOL service. For example, if you change your password in iTunes, the password you use to log in to the AOL service doesn't change.

If you have synced your iPhone with iTunes before you forget your iPhone password, you can reset your iPhone by using iTunes without losing data. Through iTunes, you can restore your iPhone from the last backup and remove the passcode from your locked iPhone while retaining your data. If iTunes asks you to enter the passcode, try another computer. Otherwise, you have to follow the reset iPhone Passcode with Recovery Mode section below. The following steps will show you how to reset iPhone password with iTunes.
Step 1. Connect your iPhone to the computer with via a USB cable that your iPhone has trusted.
Step 2. Launch iTunes. If you've synced your iPhone with iTunes, then no "enter password" is required.
Step 3. iTunes will automatically sync your iPhone and create a backup file. If it doesn't, you should sync your iTunes and create a backup file manually by in the Summary window.
Step 4. In the Summary window, you can see the option "Restore iPhone". Click it and follow prompts to choose the latest iTunes backup to restore your iPhone.

After the restoration process is complete, your passcode will be erased and all your data will be restored from your backup. You will now be able to access your iPhone without any passcode. And you can set your new password on iPhone.

For more methods, check: How to Reset Password on iPhone