It helps if you look up how to fold a cloth diaper. The triangular way is pretty easy, i do it with a bathtowel when i get the urge.
Take the towel and, if it's a regualr sized one, fold it in half. Then, take the top part with the two loose end. Fold that over a tiny tiny bit, only enough to cover up maybe...2 or 3 inches. Then take the top, where the fold is, and fold it like a paper airplane. then sit down and bring it ...up... It also helps to have safety pins, or diaper pins. I have one. They dont bend very eaisly like the regular kind.