Change password via PlayStation 3. 1  If you know your password and know the email address associated with your PSN account, click here. 2  If you don't know your password, but have access to the email address and the date-of-birth associated with your PSN account, click here.he easiest way, however, is via the PS3 - click the Sign In button, and you will see a Forgot Password? option on that screen. From there, follow the instructions to reset your password.