Hi,
Strangely enough I just took mine off yesterday to clean it.
There are 3 screws under the label on top of the screen. If you pull the sticker almost off so it is still attached on an end, it will be easier to fit back in the right place.
Then when it comes off, the screen is retained by a plastic besel on the inside that you can carefully pull out. It's secured in the corners with a friction fit lug.
There should be a metal spring at the bottom that fits in two little slots that presses on the bottom of the screen as well.
Hope that helps.
Ash.