if u look up through the holes in the trunk where the light is, you will see 4 green tabs. you need to release the tabs and push them up. these 4 tabs hold the light housing in place. ones its out you can then unbolt the lense from the housing. its not easy unless you have a tool to fit in there.
might help to have something to pry between the housing and the body of the car, just to help keep the tabs released. just be careful.
