This is a really simple install. With your rear hatch door fully open, locate your third brake light. Notice there is a gap between the light housing and the glass window. Slide the brake cover in between the glass and your light housing.
You want to make sure the text reads properly if light were to shine through it. It will not fit backwards (unless you force it — it won't fit well).
If your brake light cover does not use text, you can easily line the bottom tabs with the tab locations in the design.
The top portion of the cover (when looking at the illustration above) is designed to slip into your weather strip. The red arrows signify where the cover is securely held when fully installed.
It might be easier just to watch the video below!
Video walkthrough
If you haven't purchased a cover yet — I offer many designs and even a custom option: