Instructions
Open the "PlayStation Network" menu on your PlayStation 3.
Choose "Account Management."
Select the "System Activation" menu listing.
Choose the "Deactivate" option. This will deactivate your PlayStation 3 account and separate it from your console.
Select the "Sign In" option from the "PlayStation Network" menu. Type your PlayStation Network email address and password into the boxes. Choose "Sign In" to reactivate your PlayStation 3 account on your console.