Lay the central brace on the floor. This is the long, hinged V-shaped piece. Line up the pre-drilled holes and screw the shorter cross bar to the top of the brace, and the longer cross bar to the bottom of the central brace.
Hold the left leg against the upper cross bar. Insert a screw into the hole in the leg, and tighten it into the upper cross bar. Line up the leg with the bottom cross bar, and screw through the leg to attach it to the bar. Repeat with the right leg.
Line up the pre-drilled holes on the lower canvas support with the holes in the legs. Attach with screws.
Slide the upper canvas support over the central brace, and tighten by turning the adjustment knob clockwise.