Things You'll Need
Instructions
Connect the serial cable running off the Sony PlayStation 2 controller into the serial port side of the PS2-to-PS3 USB adapter cable.
Plug the other end of the adapter into the PS3's USB port. Although the PS3 does support wireless gaming controllers, you must leave this controller connected to the gaming system (PS2 controllers are not wireless).
Power on the Sony PlayStation 3 and you can begin playing all of your games with the PS2 controller.