To place the tassel on the leather string I used a small pair of pliers to open the ring and then placed it wherever I wanted and pinched it closed. If this is too hard to do you could undo the gladiator string and pull them on and re string them onto the sandals.
** Just beware you'll have to move the rings along the leather string to place them randomly when you're re stringing the sandal.**
I hope the pictures help because writing it out kind of sounds confusing! It's so cheap to do, only cost me about $4 for the bracelet thread and rings since I already had the sandals. I've linked a few different types of gladiator sandals if you're interested in purchasing some to try this!
Gladiators (+ 30% off)
Thanks for reading and if you have any questions please leave a comment and I can try to answer it!