Using a Philipps head screw driver remove all screws marked with a green ring.

Also loosen the ones with an orange ring as far as possible. (They are the two screws closest to the hinges of the screen) Since these are retaining screws, they should not come out completely

If one (or both) do come out, that's no big deal. Just make sure to find and remove the metallic ring that was supposed to hold them in.