Instructions
Turn on your PlayStation 3 home console and log into your profile on the console.
Insert the GameShark disc into your PlayStation 3. The disc will now be listed in the "Games" column of the console's main menu.
Start the GameShark CD by navigating to the "Games" column and pressing the "X" button on the image of the CD. The disc will boot and you will be able to select the games and codes you want to use from the device.