I know, as I was only told the other day

You'll have to hand wind it onto your bobbin. Not too tight, not too loose. If you wind it too tight it will break. The top thread is standard sewing thread. Use a color which matches the fabric, to best hide any wiggles and wobbles. If you go out of line slightly, don't worry. Sew slowly. And I think you use a zig zap shaped stich but iy may be call an elastic stitch...

I will PM you a link to a blog on how to do it, because it has advertising I don't think I can post it directly