If the car is equipped with a manual trans, the switch is mounted on the drvr side of the trans. Back the car up to the garage door, loosen the two mounting screws, 5/16 inch wrench, and rotate switch until lights go off. Select reverse to turn on, nuetral to turn off. make sure the two bolts holding the bracket onto the side cover are tight first.
If car is automatic, the switch may be broke. Column shift is on the bottom top of the column next to the firewall, console shift, on the pass side of the shifter. If engine starts in reverse, switch is bad, replace it.
Oh, Welcome to the Club! Turn the lights out when you leave.