See the way it has two tails (or rather that the tail separates into two chunks)? You tie those in a knot through the loop. Mine was way too big to do that so I tied part of the bracelet in a knot through the loop and cut off most of the tail.
It was a little tough to figure out how big to make it-I didn't want it to come off all the time, but I don't want to swell and have to cut it off early either!
I figured that you could pull the tail through the loop at the top, then tie the tail to whatever part of the bracelet you needed to to make it fit right. It will probably require help, though... I had to get Mike to tie mine on.
Rynna, Mama to Bean (8), Boobah (6), Bella (4) and Bear (2)