Foam had torn off the flap door and the black thingy had broken.

Pulled off front. Detached wires without getting electrocuted. Marked them first so I'd know where they go. Pushed up the thing with wires so I could see the flap door. It had a heat thing in the flap which my replacement part didn't have, so I had to pull it out of the broken flap and insert in the new flap. Snapped flap door in place. Attached black thing loop to white thing. DIdn't use the spring or the white thing. Reattached wires and put on front piece. Everything now works. No more frost in the freezer!!!