Question: how to connect my ps3 controller to steam?
Answer: Plug your Dualshock 3 in. ...  Get PlayStation Now and install it. ...  Re-plug your Dualshock 3, go to the Control Panel -> Devices and Printers, find your Dualshock 3 there, right-click it, choose "Game Controller Settings", select your Dualshock 3 and press "Properties". ...  Start Steam.