Advice needed, please help

Advice needed, please help

 

We are a charity radio station and we do not stream to the public. We are however using a broadwave streaming server to allow the enigineer to log in and check all is ok. The problem is the IP address of this server has been compromised by a member and we would like to set up a stream which can only be accessed with a password.
How could this be done?
Any help gratefully received.