Use a T5 Torx screwdriver to remove the nine screws securing the inner plastic frame:

Five 11.8 mm-long screws

Three 5.6 mm-long screws

One 5.6 mm-long screw

This screw is covered by a piece of black plastic tape. Use tweezers to remove it before unscrewing.

Throughout this repair, keep track of each screw and make sure it goes back exactly where it came from.