Go to your Admin Dashboard (My Organization).
Select Users.
Locate the person (they must already be mapped to a site via SSO).
Click the three dots (More Actions).
Choose Assign Site Admin Role.
Select the appropriate site(s).
Important Notes:
Only Org Admins can assign Site Admin roles.
The person must already be mapped to a site through the SSO data sync.
Sites cannot be assigned manually—users must already exist in the shared SSO sync.