Use Heat 'N Bond on your circle, fold it in half, align it with two of the blades of the fan, iron in place so it will stay put, and sew it on. I put my circle on top of the hole and machine stitch it with a blanket stitch. It sounds like you are going to put the circle underneath the dresden plate, am I right? I have always done it on top of the DP, never underneath...I may have learned something new today!