Instructions
Turn on the PS3 console by pressing the power button on the front panel or by pressing the "PS" button on the PS3 controller. The user login screen will appear.
Use the directional pad to select the user account to be deleted and press the "Triangle" button on the controller. A user account options menu will appear.
Select "Delete" from the menu and press the "X" button. A confirmation dialog will appear.
Select "Yes" and press the "X" button to confirm account deletion. The account is now deleted, while the other accounts remain.