replacing top taillight bulb

I cannot seem to remove the lense of the top taillight to replace the bulb at the top of the truck. I uncrewed the bolts like the manual said and still wasn't successful. Can someone please tell me what to do?

The bolts come off and it slides out, however, it may have some clips on it as well. make sure you have all the bolts out and use a flat screwdriver to pry it out, using SLIGHT pressure, don't pry very hard or it will break, however this should allow the lense to come off, then its a simple bulb replacement.