Third brake light replacement

You need to open up the trunk, and its going to be on the lid/ top of the trunk. More then likely your going to need to remove the entirior lining, the lining that makes the trunk look good bascily, to keep it from showing the bare metal, it should pull out by removing those plastic tacks, and then you will see the blub unit and assembly and you should be fine from there, let me know if this helps or not.