Ok, there are a few points that have to meet/overlap, whatever...
First point is here on the cover...

... that needs to fit OVER this ridge on the body:
next is this part on the cover (ignore my thumb, look at my finger)
that goes inside, or BEHIND the trunk liner here:

... like this
here's the first part going over that ridge:
outer ridge on the rear of the cover (closest to tail light) ...

... which fits inside this ridge here in the trunk liner:
bottom edge here on the cover

goes above this ridge on the liner .. hehe, peace man
... and that's it, I forgot to take a pic of it on, but trust me, it went in. It's not glued-on firm in place, but it'll hold. Hope this helps hehe, I guess I felt like doing a walkthrough, regardless of how lame it is.