[ovirt-users] Adding user to internalz with webadmin?

Hi! How do you add users to internalz with webadmin? I mean there is add a button in Administration->Users which opens 'Add Users and Groups'-window . Windows has 'Add'- and 'Add and close'- buttons in the bottom. Just can't figure out how they work. Pushing either of those Add-buttons just closes the window. -Juhani