Don't forget to prime the clicker first - just click then treat a few seconds after (don't click as you feed) a few times until your rabbit gets used to the noise and starts to associate it with food - this will be obvious as when they are looking the other way and you click they will immediately look at you waiting for their food - I did a couple of short 5 min sessions every day until I was sure Adele got it.
Once they know the click means food they then start trying to work out how to make you click so put the target stick in front of them and inevitably they will go over to sniff it - as their nose touches it, click and reward. Eventually as you put the stick near them they will run over to touch it to get some food - then you can use the stick to get them to follow it onto boxes, over jumps and through tunnels.
Always remember if you click you must treat - eventually you may phase out the clicker and just reward every so often as the training becomes second-nature. Timeing is cruicial, if you click at the wrong time they won't learn.
Caz