Samsung SyncMaster 720XT User Manual page 19

Monitor Mounting interface pad ( Sold separately )
Turn off your monitor and unplug its power cord.
Lay the LCD monitor face-down on a flat surface with a cushion beneath it to protect the screen.
Remove four screws and then remove the stand from the LCD monitor.
Align the mounting interface pad with the holes in the rear cover mounting Pad and secure it with four
screws that came with the arm-type base, wall mount hanger or other base.