How do I remove the tail light cover on my 2004 lincoln navigator to replace blinker light?

Turn the ignition and headlight switch off. --- 9 Open the Navigator's rear liftgate to expose the taillight assembly mounting screws. ---- 10 Remove the two screws. Pull the taillight assembly straight back away from the vehicle. This will expose the bulb sockets. ---- 11 Turn the middle socket counterclockwise to release it from the assembly and pull it out. ---- 12 Pull out the old bulb and insert a new one. ---- 13 Insert the socket into the taillight assembly and lock it into place by turning it clockwise. ---- 14 Reattach the taillight assembly and replace the two screws. Close the liftgate.