How do you get a pony to jump while someone is riding it?

Well assuming the pony is over 3 years old and has a reasonable amount of training, it shouldn't be too hard to get the pony to jump on it's own. keep up a good pace at a trot or canter and direct the pony at a low jump and as it gets closer continue to urge it forward a bit so that it gets the idea that it's supposed to go over the jump. If the pony refuses you might have to train it to jump by leading it over some low poles and eventually lunging it over some jumps.
Well assuming the pony is over 3 years old and has a reasonable amount of training, it shouldn't be too hard to get the pony to jump on it's own. keep up a good pace at a trot or canter and direct the pony at a low jump and as it gets closer continue to urge it forward a bit so that it gets the idea that it's supposed to go over the jump. If the pony refuses you might have to train it to jump by leading it over some low poles and eventually lunging it over some jumps.