Under the ring there should be a diagonal slot.Tuck that leftover piece of the vertical part into that slot.You're done!
This is a instructable on how to make a dollar ring.Follow the instructions carefully to get a nice ring.
Step 1: Prepare the bill
Get any US 1 dollar bill,George Washington facing up, and fold the back bottom margin up (Note I said back bottom margin.It means to start at the back, and fold it's bottom margin to the front.Then flip the bill over again.).