You need to remove the 2 screws that are part of the stand. Then you remove the plastic feet at the bottom of the unit to reveal 2 more screws. After that, you'll need a flathead screwdriver (can scratch) or use something like a guitar pick or something like these plastic opening tools used for phone repair (https://www.ifixit.com/Store/Tools/Prying_and_Opening). You then use that tool to wedge the plastic apart around the edges and work your way around the entire device until you can pull the back off.
You'll want to do this with the screen side down on a flat table.
