Open the trunk lid.

Remove the socket from the housing by turning the socket counterclockwise until the tabs on the socket align with the slots on the housing.

Remove the bulb from bulb-socket by pulling it out.

Insert a new bulb by inserting it into the bulb-socket.

Install the socket in the housing by aligning the tabs on the socket with the slots in the housing. Push the socket into the housing and turn the socket clockwise.