I don't even remember, I just looked at how the new one mounts and did the reverse.

What I can remember:
Open gas cap (if you can)
pull back the inner hatch liner to access the rear where the cable goes
I think the popper might twist 90 degrees so you can pull it out
I don't remember if you unhook the cable from the popper first or vice versa

Sorry, maybe someone else can chime in. The main thing to remember is to have the popper in and cable PROPERLY connected before closing the cap, otherwise you'll need dental pics to break in.