Are you speaking of the trim around the hatch glass?
You have to remove the lower piece or the piece closest #3 to you by remove the two finisher clips #4? with a 10mm and pull off the trim from the edge unclipping the six clips and pushing forward to release it from the guides near the glass.
The side pieces #2 just pop off and then you can remove the center piece #1 closes to the front of the car.
Here's a pic
rear trunk removal