Ty, Its undert the User CP in:
"Edit Profile Details"
Look under 'additional info' for the 'PSN ID' part. Enter your PSN ID in the available space, then follow the instructions that go along w/ it (which are listed below)
In order to activate your Playstation Gamercard. You need to login at
www.us.playstation.com with your email address and password. Then click on Portable Id to activate you gamercard to be displayed. NOTE: Once activated, you will need to do this everytime and there is a button called Refresh that you will need to click to update your latest trophies and info. It does not do it automatically.