replace tail light I have to replace the lens fixture

Check out the diagrams (Below). You need to remove the rear bumper to replace the taillight lens.
Step 1- Remove the two caps on the center top of the bumper and remove the two 10mm bolts.
Step 2- Remove the splash guards if you have any
Step 3- Remove the 2 screws behind the splash guards on both side of the bumper.
Step 4- Remove the 2 screw on the side of the bumper.
Step 5- Remove the 2 plastic clips under the center bumper
Step 6- Pull the bumper out.
Step 7- Open the trunk and remove the trunk side trim (back of the taillight)
Step 8- Remove the 3 8mm bolt from inside the taillight and disconnect the connectors
Step 9- Remove the 2 10mm bolt from outside the taillight and remove.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.