If you mean the shift indicator light, it's easy. Stick your fingers into the shifter slot under the right of the shifter and pop that plastic pannel out, take a screw driver and remove the two screws and take the shifter slector plate. To the left of the shifter there is a little hole, under that is the bulb, put your car in netural (don't for get to set the parking brake) just pull it out from the botom of it's housing. I belive the number is a 2112 for the bulb or W1.2W.
Good luck