The OpenID is already setup in the Identity Portal and the users can login to the Identity Portal UI without problem
How to configure the Identity Portal Admin console to use the OpenID as well?
Identity Portal 14.x
From Identity Portal Admin Console, select menu Elements > from left menu under Environments select Profiles and locate 'Portal Admins'
Edit "Portal Admins profile" and configure the Member Scope with the users you need to have access as Portal Admin privileges.
Examples:
This configuration would allow specific user id's 'imadmin' and 'bob' access to Portal Management:
This Configuration would allow members of the Admin Role 'PortalAdminRole' - where 'PortalAdminRole' is configured in Identity Manager:
This configuration may require additional configuration to work, one example or additional configuration would be to configure the Admin Role in Identity Manager and add users to that Role.