First you want to teach them to run up and down . some breeds just aren't good at running, for example, I wouldn't have a French lop start on hopping. It also comes down to your individualtoo some of my mini rex will do it just fine, others want not hing more than to just take a nap. For starting off a new rabbit, I use one solid piece of wood, so they can't nudge it off. Once they go over that several times, add another bar. I put a piece of pvc pipe in her cage so she had to jump to get from old to the water.
Treat often with there favorite things. The hardest part is getting them to run and jump, once you get that down, it's just increasing it.