According to the Helms manual, there should be a plastic (or metal?)
holder through which that screw (according to the figure it is a screw,
not a bolt) holds the tail light from below. On either side should be
two bolts. Try removing them, and taking off that plastic/metal clip
thing as well. The diagram in Helms manual indicates 3 bolts from
inside the trunk, and 1 screw and 2 bolts from below (between the
bumper and light).
Hope this helps.

ddog3086@gmail.com wrote:
> Hi,
>
> I broke my driver's side tail light (Outer light) while parking. I
> bought the OEM parts for replacement. However, I could not pull the
> broken tail light out of the car. Any advice is appreciate it!
>
> This is what I did.
> (1) I unscrewed the 3 nuts
>
> (2) I went undneath the bumper to unscrew the bolt holding the
> taillight.
>
> Thanks