You've already removed a bunch of this panel's fasteners. On the left edge of of it, there was a black screw at the top corner and a tab half way down from it. On the right edge was a black screw at the top, plus a tab and three push clips running down the right edge. You've also removed the three push clips along the top securing the top panel.

Now use your phillips screwdriver to remove the two black screws in the right side panel, one on each upper side of the filament spindle.

There's also a tab in between them that will just slide out.