how hard is it to change this thing? i just put in a clear one and the one on the right doesn't seem to want to stay in there. it's like there should be a nut on the other end of the screw or something, but there isn't. the whole that the screw goes into is bigger than the screw...am i doing something wrong?

 

What you might want to check, if you take the bumper light back out ... where the screw should go into, there should be a little metal bracket. When the screw is going in, it goes into the metal bracket and tightens down. If this is missing, it won't tighten down ... hopefully that makes some sense ... so I would check to see if that is there.

 

yeah its pretty easy. unscrew it, put the new one in and try to line up the screw up with the bracket.