You really need to tell us what you're actually trying to do. You can access the stop light by removing the license plate light (2 screws above the plate itself) and then reach up. You can disconnect the wiring connector from there. If you want to remove the light itself, be warned that it's both 'glued' (3M-type foam tape) and clipped in. If you are replacing it, just cut the tabs off and use a hair dryer (or similar) to soften the glue before carefully levering it out.
Ahhh, I think you mean your torsion bar is broken. You'll have to take off the rear bumper to replace it. There's a writeup somewhere on one of the fora, but I don't have the link... you'll have to search.