Are you referring to an "Indexing" 'Group' in your Ward/Banch?
As far as making a member of an "Indexing" 'Group' as an "Administrator" (ie. Group Admins):
Go to you 'Group'
Go to "Options" = Towards the Top right-hand-side of page/screen, Select that.
On the 'Drop Down' Menu; then, select "Manage Members".
For the particular members of your "Indexing" 'Group' that/who you want to ALSO make "Administrators" (ie. Group Admins); then ...
On the far right-hand-side, select "Manage Roles".
A "Pop-Up" (or, aka, a "Modal") 'Window" will appear.
"Tick" (ie. "Check") the 'Box' for "Group Administrator"; and, then select "Apply".
But, remember, an "Indexer" has to Index over 1000 Records before they become "Eligible" to become a "Reviewer".
Just making an "Indexer" a "Group Administrator" will NOT give them the rights as a "Reviewer", if they have NOT Indexed over 1000 Records.
Here are some "Knowledge Articles" in "FamilySearch" on the matter:
How do I become an indexing reviewer?
Group administrators cannot grant review rights to group members.
If you need someone in your group to be granted review rights before he or she indexes 1,000 records, send the request in an email to: [email protected]
Be sure to include a justification as to why the person should have review rights.
What does a reviewer do in indexing?
I hope this helps.