Here's how to remove the rear bumper cover.
1. Open the trunk to remove both rear lights.
2. Remove the 6 plastic clips holding the top portion of the bumper.
3. In the wheel wells, remove the 4 fasteners holding the corner of bumper.
4. Underneath the trunk, the bumper is held by 3 clips. So remove those, then gently pull the bumper away from the car body.