Rather than open up the hole, just remove the whole piece.
I've done this on mine. LH side is easy - Rh side is not.
There's two plastic 'rivets' - pull the center out, and the whole rivet will come out.
I think there is also a screw.
Once you have undone all these, you may need to undo the screw which holds a pipe in place which is in front of the radiator. This will let you flex the pipe so the plastic air intake will slide out.
You may need to remove the top screw which holds the plastic bumper cover in place - then you cn flex the bumper.
Seeng as though you only have one air intake, you do not need to bother with removing the RH side.