Where are the Group Admin controls - not showing!

I just installed the Group Calendar. In the instructions it states: The Group admin controls who can create and modify events for the group via Group Calendar Settings options on their Group Setting admin page.

Group admins can enable or disable email notification for new events using Group Calendar Settings.

I am running the latest WP and BP versions, and using Evolve theme...yet I cannot see where this Calendar settings is, its not in the Group settings, nowhere on the front end do I see an Admin link under the group menus as per your example.
Where can I get to the group admin Controls, I have been through everything and not seen this option.