You can be signed in to up to six devices at once. You may reach your device limit and need to deregister one of your devices at some point.
1. Tap the More link at the bottom of any screen.
2. Tap Preferences.
3. Tap Deregister Device.
4. Tap Deregister to complete the deregistration. Once you have deregistered your device, all titles you have downloaded to the device will be immediately removed. Tap Not Now to cancel. You'll be redirected to the log in page to log in to a new session.