Are you trying to create a user with MusicDB selected as the Enterprise Connector?
The Create User tab in the MEP Admin Console which you bring up by
should have the following fields
This becomes the username for this application.
This is the password for the Enterprise Connector.
This is the username for the Enterprise Connector.
This is the phone number of the user's mobile device, which will be used to send messages from this application (push notification)
Please provide more information on what you are experiencing and trying to do.