if you forget your password:
To use this feature, you may be required to update the system software.
You can use the following method to reset your password if you forget it.
Select [Forgot your password?] from the sign-in ID (e-mail address) and password screen
Enter your sign-in ID (e-mail address) and birth date.
4.Select the method for changing your password..
1.Reset Using Security Question
You can reset your password by providing the answer to
the security question that you selected when you created your
Follow the on-screen instructions to complete the operation.
You can reset your password using a PC.
An e-mail message is delivered to the address that you used as your
sign-in ID. Follow the steps in the e-mail message to reset your
password using a PC.
you ca visit this site for more guide...http://manuals.playstation.net/document/en/ps3/current/account/forgotpw.html
sir if you think this help you rate me sir thank you...