Start by mixing all the dry ingredients together. If you use powdered buttermilk add the powder now, then when you add the liquid just add the appropriate amount of water.
Mix in your water, or actual buttermilk. I used to use actual buttermilk, and I always had big plans for using the entire jug of it before it went bad, but somewhere along the way I never quite managed to follow through on them and there was frequently buttermilk languishing in the back of the fridge. But then I heard that the powdered stuff works just fine and I haven't looked back since.
Anyways, once everything is combined, dump it onto a baking sheet and form it into some sort of uniform loaf type shape, the recipe says to score it, which would imply a much dryer dough than what I had, but then again, I didn't knead it all so there you have it.
Bake it until it sounds hollow when tapped on the bottom, which is actually not what the recipe says, but how I judge all my bread even though I cant always tell if it sounds hollow or not, I guess I should have spent more time a la Trixie Belden solving mysteries and rapping on walls looking for secret passages in my youth.