Maybe you were looking for one of these abbreviations: RCMX-RCN-RCNC-RCNN-RCNO-RCO-AK-RCO-NE-RCoA-RCOCI-RCOE.
Measure the width of your quilt and add 4-6 (or chosen excess). Design a backing to equal that width, adding 1/2 to each panel for each seam you'll use to sew it to a neighboring panel. Cut panels to the length of your quilt plus 4-6 (or chosen excess). Sew panels together with a 1/2 seam allowance. Press seams open to reduce bulk. Press backing before use.
You should be able to see a little of the backing all around the outer edge of the batting. If you opted for the adhesive spray, use it now to spray a very light coating on the top of the batting. If you aren't using the spray, skip that step. Lay the quilt top, wrong side down, on the batting. Center it so you see about the same amount of batting all around the outer edge of the quilt top.