Overview
In Zoho Connect, we have three roles for groups- admin, moderator, and member.
Admin
A person who creates the group is by default the admin of the group.
A group admin can,
Add and remove members anytime
Enable and disable built-in apps
Moderate posts and comments
Lock, archive, and delete the group
Allow and restrict permissions for group members
Moderator
Moderator is someone who can supervise posts and comments before they publish on the Group wall. They can approve, edit, and delete posts and comments in the group.

By default, the group admins are moderators. However, any group member can be made a moderator by the admin.
Member
Members are the people who're added to the group by the admin. They can view, react, and publish posts and comments in the group. Also, they can access all the built-in apps enabled by the group admin.
Changing user roles in a group
As a group admin, you can change the role of a user in the group.
To change user role,
Click the three dots (...) icon near the group header.
Select Settings from the dropdown.
In the Members tab, click the gear icon next to the respective member
From the dropdown, choose whether you'd want the user to be the admin or moderator.

You can have multiple admins and moderators in a group in Enterprise and Ultimate plans.