Place the flat portion of the flush-mount hanger in the center of the top wooden support. Measure if necessary to ensure it is centered.
Slide the hanger down to the bottom edge of the support, until the hanger's 90-degree bend slides off the wood and the hanger lies flat with the sawtooth edge extending in slightly toward the fabric of the canvas panel.
Mark inside the screw hole on the fastener and set it aside. Use a drill to make a 1/4-inch-deep pilot hole in the wood. Work slowly to keep from cracking the support.
Replace the fastener and secure it by screwing the included 1/4-inch screw into the hole.
Hammer a 3-inch nail into the wall, leaving between 1/4 and 1/2 inch exposed out of the drywall.
Hang the canvas on the nail using the fastener.