I want to change my password but they ask me username and password (authentication required)

Enable POP3 in Gmail.
Save Changes when done.
Configure your client to match the settings below:
Incoming Mail (POP3) Server - requires SSL: pop.gmail.com
Use SSL: Yes
Port: 995
Outgoing Mail (SMTP) Server - requires TLS or SSL: smtp.gmail.com (use authentication)
Use Authentication: Yes
Port for TLS/STARTTLS: 587
Port for SSL: 465
Account Name: your full email address (including @gmail.com or @your_domain.com)
Email Address: your email address ([email protected] or username@your_domain.com)
Password: your Gmail password

Incoming Mail (POP3) Server - requires SSL: pop.gmail.com
Use SSL: Yes
Port: 995 Outgoing Mail (SMTP) Server - requires TLS or SSL: smtp.gmail.com (use authentication)
Use Authentication: Yes
Port for TLS/STARTTLS: 587
Port for SSL: 465 Account Name: your full email address (including @gmail.com or @your_domain.com) Email Address: your email address ([email protected] or username@your_domain.com) Password: your Gmail password

This means that the file you are downloading from a site requires a Username and Password, enter the Username and Password which is used on the site which you are getting the file from.

authentication requered username and password should me

Just create a new account and register as a new user. Then download the video and enter new registered account information(new username and password) for authentication.
Thanks

Internet settings are usually found under the Phone Settings – Internet Settings.
- Connection mode Connection orientated / permanent / continuous connection
- GPRS APN live.vodafone.com
- Homepage URL http://live.vodafone.com
- GPRS ID username "none required"
- GPRS password "none required"
- Port (if required by device) 8080 (some older handsets may require you to enter 9201)
- PPP authentication type PAP (default)
- Proxy authentication name "none required"
- Proxy authentication password "none required"
- Proxy login type automatic (default)
- Security Off
- WAP gateway IP address 172.030.038.3 (your phone may require 172.030.038.003)

If you phone is a Vodafone NZ supported handset you may be able to have this sent automatically to your phone.

Mobile settings for sending and receiving PXTs (MMS messages)
The PXT settings can usually be found under Message Settings - MMS setting. You also need to send a message before you can receive one.
- APN live.vodafone.com
- MMS server address http://pxt.vodafone.net.nz/pxtsend
- Connection mode Connection orientated / permanent / continuous connection
- GPRS ID username
- GPRS ID password
- MMS automatic download On (Automatically downloads full MMS)
- PPP automatic download PAP (default)
- Proxy authentication password
- Proxy authentication username
- Proxy login type Automatic (default)
- Security Off
- WAP gateway IP address

Login with 5050 as the username and password via the web browser and turn off authentication.

Try leaving the username blank, default password is "admin. If it does not work, do you recall changing the router's username and password when you ran the cd that came with it? If you're still unable to get pass through authentication, reset the router by pushing the little reset button at the back for 10 seconds or so.

you should ask an expert by clicking here

When it asks you to enter a username and password, this is authentication. If it has never asked you that, you may have to remove and re-add your email account.

Depending on what program you're using, you might have to manually add your password to your account under Outgoing Messages. If you recently changed your password on your email address, you will have to do this.

Usually these settings can be found in "Accounts", "Account Settings", or something similar.