Draw a line of chalk from the crown of your hat to the brim. Poke your crochet hook or bent paper clip through the very top of the hat, just to the right of your chalk line. Grab one end of the small piece of yarn that you used to tie your bundle together. Pull it through the cap.
Poke the crochet hook through the hat again, this time, just to the left of the chalk line. Pull the other end of bundle tie through the cap.
On the inside of the cap, tie the two ends together. Secure with a double knot. Now, let's see a diagram of where to attach your bundles.
(Need help? Ask in the forum.)