How do you make a horse go faster?

If you're talking about in real life, it depends. If you want to trot you have to make sure you're in a active, springy walk then give your pony two nudges and ask them to trot on. When cantering, you should always start on a corner or whilst doing a circle. You have to go into sitting trot and put your outside leg behind the girth and your inside leg on the girth and then give them a nudge to ask for canter.