just pop the Black trim around the radio out from top of where teh switchs and the clock is. Use a flat head screw driver.

The only parts of the trim that shouldn't come out is teh rear side of the shifter, there're two screws there holding it. All the rest are clips. So pull out the trim from top and u should be able to see the button there.
Once u see the button, u can unplug it, stick the harness out from that hole and then plug the switch back in to the harness.