Just me, but I'd likely try to find out more about how they work before turning it over to somebody that possibly doesn't know anything more about them than I do??
There should be a manf's name on the control panel . That should allow you to look up the operator's/owner's manual with a simple google search. After looking that over, if you still can't get it to work, there's usually a trouble shooting section, or just call the people that made them and ask them for a hand?
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake