The two most basic elments of agility training are the commands are HOP and SIT.
Hop only requires stating the command (HOP) and moving in close to the bun's butt with your feet, see picture of Belle learning to hop, and perhaps applying pressure or tickling to the rabbits butt area. Once the rabbit complies be sure to use positive reinforcement.
Sit is a little harder to deal with. Using a harness/leash keep the bun from moving away from you, don't stop the rabbit suddenly you can hurt it that way, once the bun stops use the Sit command with positive reinforcement and relax the tension on the leash.
Good luck training for Hop and Sit.