September 13, 2012, 5:40 PM — Here's how you can remove an email address for FaceTime in iOS 6.
1. Open the Settings app.
2. Tap on FaceTime.
3. Scroll down to the email address you want to remove.
4. Tap the blue arrow to the right.
5. Tap the Remove This Email button.
Your email address will be removed and it will no longer be associated with FaceTime in iOS 6.