Instructions
Check the charge of the controller, if it is plugged into the console, by holding down the "PS Button" in the center of the controller. Then check the status of the controller, indicated by a battery bar onscreen.
Unplug the controller from the USB cord.
Press and hold the "PS Button." Once activated, it will be assigned a player number -- indicated by a flashing light at the top of the controller.
Turn off the controller by holding down the "PS Button" and selecting the "Shut off Controller" option.