Hold the sliding canvas against the wall in the spot you want to hang it.
Make a pencil mark on the wall just above each of the mounting brackets on the backside of the canvas. These marks will help you determine where to place the wall hooks.
Use a level across the marks on the wall to make sure when you hang the photo that it will be level.
Hammer the nail of the J-hooks into the wall so that the hooks line up with where the marks on the wall suggest the mounting brackets should be.
Hang the picture by securing the mounting brackets on the J-hooks.
Lay the level on the top of the canvas and determine if any adjustments need to be made.