how do i replace taillight bulb drivers side on 2006 Mercury Milan

drivers side taillight not working

Asked by for the 2006 Mercury Milan
the lens may have 2 screws trunk area then snaps in on other side
i dont know im reading that you have to replace the whole tailight assembly is that possible like $400 repair????
i find that hard to believe. who is telling you this?
just researching how to do it online also manual for car says something like that.