Look on the Slingshot website. When I changed mine over from 2:1 to 1:1 thats where I got my information from.
The instructions were poor at best though and it did take a few attempts to get it right.
If you get stuck pm me and I can talk you through it.
I found the kite to be better on 1:1 than 2:1. It was faster, more responsive and all in all had a better feel to it. Just my opinion.
-edit- If you are just learning then leave it on 2:1 untill your going upwind at least