Next you need Magic Sizing, a paper cup and small cheap paint brush. Put the mylar circle in the center of the piece, pull the strings to gather around the mylar circle. Hold and paint on some magic sizing onto the back with the paint brush (spray the magic sizing in the paper cup, it turns to liquid). Let me tell you - I needed 4 hands to do this and take pictures!
Then gently pull the strings again to get back the shape and knot the thread, then trim off tails.
In no time at all you have a ton of fun circles to applique down. I then use Roxanne's Glue Baste it to attach them to where I want them on my applique piece and sew them down without having to turn under edges or remove freezer paper!