where to top the plant

So this plant... how do i top it? i understand that it grows two colas. now where will my other cola grow from? i see all these videos of two chutes side by side and from there the two grow, now will mine just be different height or what, im confused am i to asume that there will be two...

I'm curious as to when I should top my plant. Well not as worried about when but where? I've read inbetween node 3-5 and I labeled the plant with what I think the nodes are Please let me know if I am incorrect and any knowledge and help would be great, I'm just looking for a nice bushy plant...