"L" would likely be the Left stick, however it's possible that it's the buttons on the top of the controller on the left side. Depends on the game, which one they're talking about.
On the left: L1 is the top, L2 is the trigger like button below L1 and L3 is the stick (it pushes down).
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leave the PS3 turned on and change the settings to turn off the controller when the PS3 is turned off. You can turn the controller and the PS3 back on by pressing the PS3 emblem on the controller
You use the charging cable to connect the PS3 to Controller and press the Playstation Emblem on the controller
The PS3 Dual Shock 3 controller is a Bluray controller for the PS3 exclusively
When the PS3 is on use the charging cable to connect the controller to the PS3 and press the Playstation Emblem on the controller
turn on a ps3 then turn on a controller, any ps3, any controller.