Central brake light issue

I have 99 Taurus wagon. On replacing bulb in the central brake light the Haynes manual says "have it done by a qualified technician". I don't think
it should be so difficult but I don't know how. There is an access hole under the central light unit. Inside that access hole is a stud with a nut on it. I removed the nut but nothing seems to have loosened. Anybody know how to do this task?
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No one answered my question so I will. On the Taurus, one must remove the back door plastic panels in order to replace any lights in the rear door. The central brake light must be removed from the door in order to change bulbs. It must be removed using a small socket- too much pressure on the retaining nuts may pull the studs from the plastic light unit.

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