U need to unRaR the python archive and upload it to you python directory on you xbox if you havent already
you need to open the update script on your pc with notepad and edit the configuration settings to get the type of music you like. Then save it in the scripts directory on your xbox. Make sure you have the folder for the radio stations set where you want it.
go into xboxmediacenter.xml and add the path to your shoutcast radiostations; which is the radio station folder from above. Then you need to make sure you have your networking stuff all correct. Save the xboxmediacenter.xml and upload it to you xbox.
Next start xbmc goto settings, general, scripts, and run the shoutcast_update script.
Then go to your My Music tab and go into your radio station tab "whatever you called it" and select the stream you want to listen to.
I'm done holding your hand now