Using your T-8 Torx (Image 1) untighten the two screws (Image 2) and keep safe. You will only need the T-8 Torx again to replace these screws

Next use the long flat bladed screw driver to press back on the tab (Image 3 orange arrow) whilst lifting upward on the top bar (Image 3 red rectangle)

There are two lugs and two areas on the top bar to grab, once both lugs are released and visible (sat slightly forward) it is time to loosen the top plastic