Add a coating of glue to the inside of the bangle. Try to spread it evenly. It would be best to only do one section at a time, and add more glue as you go along.
Now, begin wrapping the thread around the bangle. My daughter held the end of the thread with her finger so it could dry. As you go along, squish the threads together tightly.
When you're done, glue down the end and add a thin layer of glue to the inside of the bangle. Leave it to dry.