A tutorial... hmmm. I don't know what else to tell you about making it. If you missed the add on later in the list of comments, you need to know that to turn the circle right side out, you make a slit through the backing fabric and the batting (not through the batik or the edge of the circle). Postition the slit where it will be under one of the arc flaps on the backside of the block.
I have a Janome 6500. There is an additional gizmo you can buy, Circular Sewing Attachment, P/N 200-304-003.
Jupiter