Regroup allows you to set different privilege levels for a group administrator.
First, you will go to the group's homepage and then click "Group Members":
Once you click on "Group Members" you will be shown the full groups membership, by hovering over a member you can then select from the three-dot menu "Admin"
Once you have checked the "Admin" box and then hover over that individuals name once again you will see on the three-dot menu choose "Admin Settings" and the following pop-up box will appear which allows you to choose the appropriate privileges.
For more information on the various privileges Chick Here