Cisco Unity Express and Cisco CME GUI - separate admin accounts?

In a telnet session on our Cisco CME router, I modified the web admin password:

web admin system name admin password mypassword1

And now that works fine for the Cisco CME GUI at http:\\\\addressofCME\\telephony_service.html -- but it does not let me log into the Unity Express GUI at http:\\\\addressofCME\\Web Where is the Unity Express GUI password set and stored? I don't understand how the two web interfaces have separate administration and how that is handled. The second Web interface has more features and functionality so I would like to use that one.

Thanks for your help.