Some people appear to be still confused.. I took some pictures to make it easier:
Your tail light is now ready for removal. Pull it directly away from the car, there should be no need to budge the tail lights up, down, left, or right.
It should pull straight out of the back of the car, and may require a little effort.
You'll need to wiggle the tail light wire out of the car:
Simply twist and pull out the 4 bulb holders. Push down each light bulb and twist them out of its holder. You'll figure it out.