Envision H22W Operation Instructions Manual page 5

Preparing To Install The Optional Wall Mount Arm (Not Included)
This monitor can be attached to a wall mounting arm you can purchase separately.
Turn the power OFF then dis-connect the cables from the monitor before performing
the procedure below. Lay the monitor face down on a soft surface.
1. Remove the base. It is attached to the stand by hooks.
2. Remove the 4 screws holding the stand to the hinge.
3. Remove the stand.