My FTC team can't join dashboard

I'm a coach for an FTC team. I have the "My First Dashboard," but I can't add my students to it. Online search suggested I need access to the Member Control Center app, which I don't have. We didn't fill-in the spreatsheet with team names when I applied for sponsorship because it was before the season started and we didn't have our team together yet. How can I get my students onto the dashboard so I can add them to a collaborative workspace? 

 

Edu Sponsorship