When walkin a horse behind you what do you do?

When walking a horse all you have to do is be dominant, take the lead rope in your hand and walk forward in a dominant manner. If the horse is young or refuses to walk with you, you could use a longer rope attached at the halter and run it around the butt under the tail (note you will hold both ends at the halter as usual) and use that to help coax the horse to walk at first. Usually when a horse becomes stubborn, if you release the pressure in a few minutes they will walk again.