@Iradi I believe that's just there to show that you're adding in the yellow string at that point, they label that one as C since A is the black string and B is the white. 🙂
I'm brand new to this, and I had some problems making just the H alone. Can anyone help me? I think I've been tying all wrong (like when I was doing the white of the H, I didn't even knot the white onto the background color...)??????