Here are two videos showing what looks to me like two different ways. The way I've been doing it, is how the woman says is wrong. Ok. I wonder, is that wrong? I had been told you want to do it so that if the horse pulls back it doesn't pull into a knot so tight you cannot reloosen it. But, to be honest, I am now not sure which way is correct.
A. Go through the loop, and back through the loop knot is tied ON the loop
And C. (and I don't have a video of this, so maybe it IS wrong)
You go through the loop but tie the knot abot the loop