Rabbits are easy to train with the right tools; in other words, with food, LOL. Rabbits are extremely food motivated! I had Zoey trained by voice and hand signals to come, jump up, jump down, when I said bed time she would jump on her box and wait for me to pick her up to put her in her hutch. Now that training when down the drain because I wasn't consistant after I bonded her to Mocha.
So really the key is consistancy and food. Find a treat they really like (small pieces only, you don't want to over do it) and start with saying commands when the bunny does something you like. For example, if you want to teach your rabbit to jump up on something, when they go to jump up on it themselves, say a command like "up" and reward immediately. Eventually they will start to learn that the word is associated with what they just did and they get a treat for it.
Oh and it also helps to make your rabbit work for their treats all the time. Make them do something before giving it to them.