Super Cub LP electonic question regarding flaps
 

Not sure I'm in the right place but I would like to know if anyone knows where I would plug in the servos for flaps on the Super Cub LP.
I ran across this. http://www.chrisbot.com/super-cub-lp...hobbyzone.html
His flaps engage nice and retract quick but I don't understand anything that's going on with whats he's doing to get them to do that, I'm a newbie.
Any help would be great.