How do you add 3-spd switch to Lyen 12-fet mark2 controller?

I bought a Lyen 12-fet 3077 mark 2 sensored controller. It does not have a connector for the 3 speed switch. I'd like to wire one up. So how can it be done? Do I need to open up the controller and solder some wires to some place inside?

I can't get ahold of Lyen

Easy to find on a google seach
https://www.endless-sphere.com/forums/viewtopic.php?f=2&t=50654
http://zenid10.wordpress.com/2011/08/15/installing-a-speed-control-switch/
May help you.

mucho gracias señor :lol:

second link was EXTREMELY helpful