heres a 3rd grade drawing of how it goes together.
Unbolt the steering arm, and it will seperate into two halfs. the is a notch in the upper half that lines up with the bottom, and now with the extension. So slide the female end of the extension over the upper half of the arm, tighten the bolt. pull the lower half up, making sure to align it with the notch, i dont think it will go in any other way, there is only one way it will work. slide your bolt through the extension and the lower half and your down. make sure your steering wheel is locked in the right position so it makes it easier to loosen the original bolt. or have someone the steering wheel while you break the bolt loose.