Unclip the vane assemblies, prying in a downward motion with a plat bladed screwdriver between the top of the wane and the grille surround openings. Be careful to not mar the grille surround face.
Pull the vane assembly forward and upwards to remove.
Install the mesh inserts by inserting lower alignment tabs into corresponding slows in lower portion of grille surround openings.
Secure top of the grille mesh inserts by inserting the Phillips screws through the top screw holes on face of meth and into the holes of corresponding tabs of grille surround.