Hi,here are the instructions for replacing the bulb.
Rear Turn Signal, Brake and Parking Lights
See Figures 7, 8 and 9
To remove the bulb, turn the twist lock socket (at the rear of the housing) counterclockwise 1/4 turn, then remove the socket with the bulb; replace the bulb if defective.
Fig. 7: Remove the tail light assembly screws, then the assembly - wagon shown Fig. 8: Twist the socket counterclockwise to remove from the housing Fig. 9: This type of bulb simply can be pulled out of the socket for replacementTo install: