Ok, I am officially stumped

, I'm attempting to setup my first ever ebuggy and I have absolutely no idea how I set up the mechanical brakes on my Hotbodies Ve8. I've got the steering servo in slot 1, the esc in slot 2 and just guessed and plugged the brake servo in slot 3 in my 409 receiver. Does anyone have any advice where to even start, I didn't see a thing in the manual that helped me out, I saw the mixing function which I suppose is what I need but I don't know where to begin? Thanks Q