Once you've authorized your account to communicate with Cydia, you'll need to link your iOS device running Cydia and your account. Do this by tapping the "Link Device to Your Account" button.
By Sam Costello, About.com Guide
Once you've authorized your account to communicate with Cydia, you'll need to link your iOS device running Cydia and your account. Do this by tapping the "Link Device to Your Account" button.