You just walk beside her standing at her shoulder on her "inside" and hold the reins as if you were riding. I usually get the best feel by holding the outside rein with my thumb and first finger. The inside rein is just there as an aid to keep the bend if you start to lose it. Just start walking your horse on a circle asking for an energetic walk and let the magical pull of the circle provide you with a natural bend and outside rein connection. I've been meaning to put a video up of it since I keep finding myself offering up this training suggestion.