Take another look at the instructions, all the info you need is there
I just did this modification to my controller and the only problem I encountered was that there were no instructions for the LED kit on the red PCB controller. For installing the switch I just looked at the pictures and to figure out the LED installation I looked at more pictures from the Professor Motor website.
http://www.professormotor.com/pmtr2036.shtml

http://www.professormotor.com/pmtr2036.shtml