Print Server Password

I have installed a print server (CNET CNP430 B) with HP DesignJet 500 in our network. The IP address I configure it manually. When configuring a workstation to be link with the print server it asked me for the password. I can not remember the password I used. I have removed & reinstall the program but still it is looking for the password.

Can anybody there help me with this problem? Thank you very much