The most common way people wear the piece is on their right wrist, which will sit on top of the hand. If you want to show off all the different colors in your bangle, this can be a good place to do it.
If you prefer not to wear your bangle on your right wrist, there are other options as well. You could wear your bangle on the inside of your left arm like you would with a watch or before using it as an actual piece of jewelry with another ring or bracelet around both wrists.