Geri B- here you go:
https://www.youtube.com/watch?v=Y8xblarkuBg
But I didn't do it the way she does. I do the strips separately- a strip of fabric with the batting inside folded double. The ends meet in the middle then fold and stitch. Then you zigzag the coils together in a rectangle. Mine are coils. Let me take a pic for you. It's super easy!
But it's a very good tutorial.
The only thing I don't like about the rectangular one is that you have to bind it. But I haven't gotten there yet.