Cut fabric into 13&" x 13" squares. Press and remove all stray threads. On the right and left sides of the first piece of fabric, fold and press a 1/4" hem. Fold toward the wrong side of the fabric. Fold the same edges over again another 1/4" and press.
Sew all the way along the first side. When you arrive at a corner, ensure that the needle is inserted in the fabric and lift the presser foot. Pivot the fabric on the needle 90 degrees so that you can now sew the next side. Lower the presser foot and continue sewing. Treat all corners in the same manner. After all four sides are sewn, use the backstitch feature once more to lock the thread.