Most likely.. this is coming from a newbie to quilting but plenty of sewing and heirloom sewing..
We call if French bias binding in heirloom sewing. Fold you bias binding in half the long way, press. Then place your raw edges of your binding along raw edges of your quilt, stitch in place, fold the stitched binding over the back of your quilt and hand or sew in place.
I think this is what they are referring to and hope this is clear and precise instructions.