Need Help for Topping

Hi everyone. First check my other thread please.
https://www.rollitup.org/t/250-watt-cfls-og-kush-1st-timer-need-info.906511/

I want to top my plant because my grow box is very short i want to top 1 time and make collas grow to sides with LST. But I couldnt find where to cut pls show me with pictures edited.
This is the top of my plant. painted red the main cola. I know I should cut above that but I couldnt determine where to cut because it is not straight. Please use paint to show me where to cut exactly.

I watched this video already but still cant be sure.
Is it where i marked with blue right?

no, get down into the node and get the newest sprout coming out and punch it out. Not the whole thing as you have in blue