I bought one of these several years ago but never used it. I just picked up a last minute show for this weekend and I wanted to use it but I realized I don't have the instructions. I get the basic idea of it but I'm assuming there's a certain way you do the move so it doesn't look obvious. Can anyone help?

No, I don't believe there is a certain specified way to do the change. I just show both clean sides, then have the flap side towards me so when I go to place the cloth around the hand(s) of the spectator simply pull the flap down as you are moving towards the spectator's hand. Let the movement of you going to wrap the towel around the spectator's hands cover the motion of pulling the flap down.

Thanks for the info.