Short answer
From the User Management tab, you can invite someone as an admin by email, giving them full management access to your organization.
Full explanation
To invite a new admin:
Open the User Management tab from the left-hand menu in Settings.
Click Invite Admin.
Enter the person’s email address.
Click Send Invite.
Admins have full permissions, including managing users, settings, and shared resources.
Tips
Only invite someone as an admin if they need complete control over the organization’s settings and content.
You can view or change a member’s role later from the User Management tab.