Instructions
Start up your PS3 without a game in the disc drive. The XrossMediaBar, otherwise referred to as the "XMB," opens.
Log into your PlayStation Network account.
Choose "PlayStation Network" from the XMB.
Go to "Account Management" from the "PlayStation Network" Menu. Various account options appear.
Choose one of six options from the account management page: "Account Information," Sub Account Management," "Redeem Codes," "Transaction Management," "System Activation" and "Facebook." See Tips for descriptions of each menu.
Change your desired account's settings in the resulting menu.