To register a Kindle, tap the Menu icon on the Kindle and select Settings. Once you have reached the Settings option, select Registration. You can then select which Amazon account to link to your Kindle. If you do not already have an Amazon.com account, the screen prompts you to create one.How do I Register my Amazon account?
To register your Kindle: From Home, tap the Menu icon, and then tap Settings. Tap My account. Choose the Amazon account you want to use on your Kindle: If you already have an Amazon account: Tap that option during the setup process and enter your Amazon account information.