moonpi, it is the same as any rag quilt. just sew 1/2 or 1 inch in from the raw edge all the way around. then snip snip snip. i usually use 1 inch seem allowance but this one called for 1/2 inch.
the lady on the show had one that she had put a binding on, but i like the rag edge. can't imagine trying to bind over those thick seams.