Ok, if the folded strip is for your binding, this is what i do. I take a long 2 1/2 inch strip, i make sure its a couple inches longer than the length of my quilt, just in case :) , fold the raw edges together, wrong side of fabric together, and iron. Then, lay the raw edges of your strip, still folded, on top of your quilt, line the raw edges of your strip up with the raw edge of your quilt, and sew a 1/4 inch seam through all layers. Then trim your batting to the raw edge. Flip the folded strip over to back side of quilt, and hand stitch in the ditch. Then do the other side of quilt the same. Then when you do the top and bottom, i dont do miterd corners, i just do the top and bottom the same, but have some extra length in the strip, and turn the edge of the strip to cover your raw edge, and sew your quarter inch seam, then at the end of your seam, do the same thing, turn the raw edge to the back, then do the bottom of the quilt the same, and your done :)