How to change the high stop light on a mercury grand marquis?

To change the high stop light on a Mercury Grand Marquis, first, open the trunk and locate the plastic cover or trim panel near the rear window where the high stop light is installed. Carefully remove this cover by unscrewing or unclipping it. Then, disconnect the electrical connector from the light assembly, remove the old bulb, and replace it with a new one. Finally, reattach the light assembly, reconnect the electrical connector, and replace the cover.