With the screws removed, the black and silver housing pieces should be able to shift apart from one another.

Caution: do not pull the device apart willy-nilly. There is an internal ribbon cable attached to both halves of the housing that can easily be damaged by doing so. Slow and steady wins the race.

Gently work the black and silver housing pieces away from one another.

If the housing is a bit resistant to separating, it may help to use a pry tool along the bottom of the device where the two colors meet.