Instructions
Visit the official Sony PlayStation website (http://www.playstation.com).
Click on "PlayStation Network," and then click "Log In."
Enter your PS2 PlayStation Network user name (don't use your gamer tag; use your email address).
Enter your password (the same password used to connect to the PlayStation Network from your PS2). Click "Sign In."
Wait until you are redirected to your account management screen. From this screen, you can make changes to your account (including your billing information, user name and gamer tag).