Summarize the following:
It should be followed by an arrow. But in this case, we are searching for some internet radio to listen to, so select Shoutcast radio listings. A window shall appear with three folders: Playlist, Media Library, and Shoutcast Radio. Select Shoutcast Radio. Then you can browse through all the stations on a certain genre.

Summary:
Select the Playlist drop down menu. Go under Additional Sources. There will be a list of streams for all sorts of things, like internet TV. You should have clicked Show Playlist after this. Go through the list of genres, double click the genre of your choice, and the first station of the genre should start playing.