The mount attaches to a wooden stud in the wall. You must first find the stud that is in the right place. Then you must consider where you want to monitor to rest, decide how far up it needs to be, then where the bottom of the mount should be relative to your desk or bench top. Probe sheetrock to find the sides of the proper stud with an awl or a 1/16-in drill. The bottom hole in the mount goes in the middle of the stud. Mark the location of this hole to put the mount in the right vertical location. Carefully make a shallow pilot hole (maybe 1/8-in diameter and deep) in the sheet rock (twist a drill with your fingers), then drill the bolt pilot hole straight into the sheetrock and stud. Bolt the mount to the wall almost tight. Hold the mount vertical (use a small level for this) then carefully mark the two upper holes. Rotate the mount out of the way, make two shallow holes in the sheetrock, then drill two pilot holes. Rotate the mount up, install other two lag bolts.
After that, installation is easy: thread power and HDMI cables through the mount's arms and connect them, apply power, position monitor where you want it. Be prepared to tighten or loosen the joints in the mount so that it holds the monitor but is moveable.
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