Hold up one frame piece in the spot that will be the back of the cubicle.
Have a helper hold up a second piece at a 90-degree angle with the first place to form the left wall of the cubicle.
Attach an angle connector to the top of the intersection between the two pieces. It simply snaps into place. Make sure your walls are straight and meet at a 90-degree angle. Otherwise, the angle connector won't attach properly.
Lift up the corner slightly, and slide another angle connector at the bottom of the intersection between the two panels. Snap that one in place as well.
Repeat steps 2-4 for the right wall.
Adjust the leveling feet at the bottom of each panel, if necessary.