How do I replace the rear blinker? - 1996 Ford Thunderbird LX

The lens needs to be removed. Look behind the trunk liner/carpet covering the access to the retainers holding the lens in place. Remove the retainers ( could be plastic wing nuts or actual nuts screwed to the tail light studs. ) There may be 3-5 holding the lens in place. Once retainers are removed the lens will pull away from the vehicle and the light socket can be twisted and removed from the lens assembly exposing the bulb