Have you taught him to get use with the harness and the leash.
If he’s use with them you can teach him to walk, you can teach a rabbit to go a round same routine everyday, for example jumping around the house.
The direction you want to go and so on.
Myself it’s to lazy teaching my rabbits were to walk, so I just follow them or just let them run lose with the harness on in a open space.
Or letting them run lose with the leash after them.
But I had taught my first bunny. That when I said home he would jump the whole way home without going any where else.
I could have walked 10 mins away from the house while carrying him and say home and he would run to the house with harness and leash [emoji5]