1 Answer

You can register your Kindle online or straight from the device itself.

To register your Kindle online:

Go to the Manage Your Kindle page.
Enter the 16-digit serial number of your Kindle (Tip: It starts with "B00").
Click on "Register a new Kindle."

To register your Kindle on the device:

Press the Home button; then press the Menu button and select Turn Wireless On.
Press Menu again and navigate to "Settings" using the 5-way controller; press to select.
If you received Kindle as a gift, and the person who gave it to you is listed as the "Registered User," select "deregister."
Select "register."

If you have an Amazon account: Enter the e-mail address and password of your Amazon.com account. Navigate to "submit" using the 5-way controller; then press to select. Your name will appear as the "Registered User" when registration is complete.

If you do not have an Amazon account: Navigate to "create account" using the 5-way controller; then press to select. Follow the instructions on the screen. Your Kindle will be automatically registered.

http://www.amazon.com/gp/help/customer/display.html?ie=UTF8&nodeId=200510540