To sign out of PS3, follow the following steps: Select Settings. Scroll down and select System Settings. Select Restore PS3 System on the right-side column. Choose either Quick Format or Full Format on the next screen. Full format will return your PS3 to factory settings whereas quick format lets you save your game data before formatting. Choose Yes (at full format) or Yes (after quick format). Your system should be returned to factory settings once done; if successful, it should say "The operation was completed successfully" at the bottom of screen and automatically reboot."