How do I register my fire?

FCRA or Foreign Contribution (Regulation) Act 2010 is an optional registration certificate for NGO/ Charitable organisations/ trusts, societies and Section 8 companies. FCRA registration for NGO/ Society has been introduced to regulate all foreign contributions to a charitable organisation. It aims at providing smart, citizen centric and transparent governance to citizen and organisations in Delhi.

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To register your Kindle Fire:

1. From Home, swipe down from the top of the screen, and then tap More.
2. Tap My Account.
3. Tap Register. If you already have an Amazon account: Enter your Amazon account information. If you do not have an Amazon account: Tap Create Account to set up a new account.

Amazon.co.uk Help: Register Your Kindle Fire

or go to this link and have a read up.
How do register my kindle fire Google Search

Register Your Kindle Fire

Attached is a link that gives you directions to register your Kindle Fire 7.

Make amazon account on Your Account
To register fire TV

-Select settings from fire TV menu
-Go to my account (if your device isn't registered, register option will appear. Select register and enter amazon account information when prompted)

To enlist your Kindle Fire tablet
Access the fast settings menu by swiping down from the highest point of the screen
Tap Settings symbol
Tap My Account
Tap Register
Tip: Tap the Fire Generation 8, Fire OS 5, Fire Gen 8, Register Fire Gen 8 key to enter numbers or images. Tap the ABC key to come back to the consistent console. Tap the Shift key (up bolt) for capitalized letters. Tap the crate beside Hide secret word to show your watchword as you write.
Whenever completed, tap Register once more. Your name will show up as the enrolled client.
Click here for more information
Kindle Fire Troubleshooting

Marvin, You could try registering it on a computer, or it may already be registered. Best to contact Amazon to help sort out the register error.
Check the attached links,instruction , forums and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
http://www.amazon.com/gp/help/customer/display.html?nodeId=201539930

Kindle will not register

12 major Kindle Fire problems and how to fix them

HELP Kindle won register and Amazon won help MobileRead Forums

To buy and deliver Kindle content, register your Kindle Fire to an Amazon account. Registering also allows you to transfer purchases between devices and Kindle reading apps. To register your Kindle Fire: From Home, swipe down from the top of the screen, and then tap More. http://www.amazon.com/gp/help/customer/display.html?nodeId=201729910

Go to the fire stick manufacturers site and it should have a place to register your fire stick.

Register Your Fire TV Edition TV to Your Amazon Account. Select Settings > My Account. Select Register and enter your Amazon account information when prompted. If your device is already registered, the associated name appears on this screen.