Groups, how do I edit or remove devices?

I have just set up my new ring alarm and unbeknown to me have created a group which is now preventing me from sharing my base station with another user. I've looked on the app for group settings and there is nothing.... I've looked online and in devices it says there is a remove from group option, I can't find it. I want to be able to share the system with 2 other users.My set up so far isBase stationKeypadrange extender2 x Door contact1 x Motion sensor