Tom is right. The numbered pairs + and - need to stay together.
The first time I used Signature Rings I had to place the 20 moa inserts in the back rings and make it so all of the moa shift went to the right to get me on target. They are really cool once you figure out how to use them.
Here's a link to the Burris Website and the video is actually quite informative for a first time user, you just have to watch a little bit of advertising at the first. It is a slow moving video but could help out
Scopes - rings by Burris Optics