Melanie: First make sure your rope is tied to something which will support plenty of force. Assuming you have a quality attachment point and a good quality rope and handle you can begin this trick. Remember, the rope is your life line. When I do this trick, if I were to let go of the rope I would end up flying off the trampoline.
Now, start jumping up and down. Slowly start jumping away from the handle allowing your feet to get behind you. A good was to think of it is as a tug of war, all with your legs. Your going to jump back trying to pull on the rope like it were a tug of war. You pull with the handle to get your feet back underneath you. Let us know how it goes.