Hi Phil.
The Administrative username and password definition is requested while running the installer. This will initially populate the [install-dir]/conf/admin.password file. This will not effect the Publish.password file, where incoming credentials are stored.
The “Publishers” are added manually, as required, when configuring Wowza Streaming Engine Manager. By default, a live streaming application is set to require RTMP and RTSP authentication. If an application does not accept an incoming stream, one of the first items to check are the “Publishers” in the Server configuration section of Wowza Streaming Engine Manager.
-Tim