To edit userid and password information for the Mitel Unified Communicator Advanced program, you need to do with the Mitel Application Suite. Go to the Mitel Weblink (web server that controls your voice mail).
1. Click on Unified Communications Server Link.
2. Under Configuration, click Configure Mitel UC Server button. (Click on image to see larger picture)
3. Click Accounts button to see users. Then select the User you want to edit.
4. Under Login ID and Password, you will see the user information. You may change the Login ID and password to suite your needs. If you want to access the Unificed Communicator Advanced via a web interface or you want to access them via a smart phone, you need enable license for that. Go to the Licensed Features section and check UC Advanced Mobile for Smart Devices option.