1). Go to Music, My Music Apps, and then Slacker Radio.
2). Sign in to the Slacker app. A code is displayed on your screen.
3). On your computer go to http://www.slacker.com/home#xbox and click "Connect your Slacker account".
Note: Your browser's pop-up blocker must be disabled for this page to be displayed.
4). Sign into your Slacker account
5). After you sign in, you will be presented with a box to enter the confirmation code from your Xbox: