Carefully line up the rear camera bezel with the cutouts on the rear glass. With the bezel's adhesive side facing the glass, set the bezel down on the glass so that the camera lens cover sits in its cutout in the glass.

Make sure the camera lens cover is completely seated in the rear glass' camera cutout so that the bezel lays flat against the glass.

Use your fingers to apply even pressure to the bezel for 30 seconds to make sure the adhesive bonds properly.

Right before you install the rear glass and seal the phone, peel off the blue backing covering the camera glass.