I got excited for moment
The plastic fasteners have a pop up head, you need a small screwdriver to pop them up.
on the back of the dummy light their are two 10mm nuts
Try spraying the two 10mm nuts with lube, and use a heat gun to melt the loctite they use on the threads. If you're not careful the stud will break loose, and start turning while you're trying to remove the 10mm nuts. This is what happened to me, and I had basically destroy the dummy light lens to drill a hole to access the head of the studs to clamp needle nose vise-grips to keep from spinning while trying to remove the 10mm nuts.