It's near the bottom of this page in the manual part (above comments): https://synthiam.com/Support/Skills/Navigation/Wheel-Encoder-Counter?id=17591

It is in a section titled "How to Use Wheel Encoder Counter"

Ok. That section refers to connecting a BN-880 compass. I have the EZB controlling 3 continuous rotation servos, each of which needs to have rotations counted by the Wheel Encoder Counter. I can't grasp how the servos can be controlled by the EZB and the UNO receive data on their rotation. Obviously something I am missing here.

Click on the link, DJ post #1

. Read that manual one that link comes up from top to bottom stopping at B 880 campus.

read it several times it’s all there that Dj postage you the link.

also, watch the entire video that Dj has also posted on the same link

I don't see any info about a compass in DJ's link.