Pull the fabric tightly over the edge of the foam/board and staple it down. I actually folded the fabric so that the staple had 2 layers to grab onto to help prevent tearing in the future.
I found it was easier to stretch the fabric tighter when it was on a slippery surface like the top of the Expedit shelf, rather than on the carpet. You will want to pull and stretch the fabric generously to ensure the final product is tight with no puckering.
