Is this the one your talking about? You remove the screws and the tail lamp assy un-snaps the rest of the way.
1: Raise the rear compartment lid.
2: Remove the two lamp assembly to body attaching screws (1).
3: Pull the tail lamp assembly (2) sideways and out from the panel (5) so that the locating pegs (4) on the side of the lamp assembly snap free from the retainers.
4: Remove the sockets (3) by turning counterclockwise and pulling them away from the reflector.
5: Remove the tail lamp assembly (2) from the vehicle.
6: Remove the necessary bulbs from the sockets (3), by depressing the bulbs and then rotating counterclockwise.
7: Pull the necessary bulbs from the sockets (3), if replacing the bulbs.