With clasp fastened on your necklace, stretch it out to make 2 parallel lines.
Twist it up by putting a finger at each end and giving it a twirl.
Fold in half.Twist some more, keeping a loop at each end.
Run a chain (or single strand beaded necklace with clasp) through the loops. Slide the twisted necklace around your wrist, wrap the chain around until snug and fasten.