How do I gather fabric using the Gathering Foot?

To gather a single layer of fabric, attach the Gathering Foot securely, place the fabric under the foot, and sew. For wider seam allowances, move the needle to the left. To gather and attach a second flat fabric simultaneously, place the fabric to be gathered right side up under the foot, place the flat fabric right side down into the slot from the left side opening, and sew while keeping the two layers aligned. A longer stitch length and tighter tension will produce fuller gathers. (Page 15)