Register your Kindle so that you can use it to buy items from the Kindle store, as well as download content you have purchased to your device. In addition, registering your Kindle enables you to access content stored in your content library.
To register a Kindle, connect it to a wireless network, press the Menu button, then select Settings and then select Registration. At the Registration screen, choose either to register a pre-existing Amazon.com account or to create a new one.
There are some circumstances in which you may no longer wish have your Kindle registered. If you'd like to remove it from registration, press the Menu button, select Settings and then choose Deregister. Alternately, you can deregister a Kindle on a computer by going to your Amazon.com account, navigating to Manage Your Content and Devices, selecting the Kindle you'd like to remove from registration and clicking on Deregister.