One password for "all" accounts on uNet seems to be nice meant, but useless.
What are you talking about? You may use one uNet account within the system. That is the correct statement. If you have several accounts - you may use several passwords. It is totally up to you.
lost password function did not find any email adress filed here.
Most probably you have changed your e-mail address and didn't confirm it. Or you are using the wrong e-mail address.
Anyway, there is no need in blaming us, if you forget smth. Feel free to contact Technical Support service, just as Paradox suggested.