Theres a small screw underneath you have to take out, not the tiny screw that will be facing you thats the adjuster, the one thats pointing down. Once thats out it will slide out, it has a little piece that catches on top of the cover you'll see what i mean, it slides into place. If the little plastic grill is messed up on the covers just cut them all flush with the housing, looks better imo.
Number 11 is what holds it in place.