An administrator account for the site. Administrators have full permissions to the specific site.
Steps
Go to Persona Bar > Manage > Users.
Search for the unauthorized user.
From the Show dropdown, choose Unauthorized to filter the displayed accounts.
Browse the list for the user account.
For each user to delete, click/tap the ellipses icon, then choose Delete User.
Note: Deletion simply makes the account unavailable and revokes user-specific permissions. You must also remove the user from assigned roles to revoke role-based permissions.
What to do next
(Optional) You can purge the user account(s) if you want to permanently delete the user account and its associated information.