First of all before using any stream recorder you need to get a stream URL (you may skip this step when using WM Recorder and RM Recorder). To find the URL use URL Finder, URL Snooper or Packet Sniffer software like free Project URL Snooper (some stream recorders like WM Recorder, RM Recorder, Replay A/V, GetAsfStream have a build-in URL finder).

Just play your stream and use any Packet Sniffer and URL Snooper software to find a stream URL. It is very easy.

After that you usually don't have to worry about changing protocols and ports manually. However if you like to do it manually you may try RTSP port 554, PNM port 7070 (also known as PNA port) or HTTP ports 80 and 8080.

I also suggest you to learn more about RM Recorder. It has a very nice user guide which is easy to follow.
In the majority of cases it can record audio/video stream that your Real Player plays. Just try to play with Proxy and ADA mode. If it can't record some stream, please send the URL to me or directly to a developer.