Instructions for assembly are shown for the shelf being reversed (Back of shelf)
This also includes the drawing for the holes you need to drill in the wall so take care when marking out.
I also found it easier to dismantle into the three sections, hang the top shelf first, then the second and fix to the first and then repeat with shelf 3 to shelf 2.  
Now its up it looks good, because of the hangers off the back of the shelf it doesn't sit as tight to the wall as it could if the hangers were recessed better.