Playing
To start playing a station, you can:
Just double click an entry.
Use the ▶ play toolbar button.
Right click for the context menu and the play action.
Drag and drop it directly into your audio player. (Only on U*ix/X11 systems)
Save it (F2) to a playlist file, then start your player with that.
In streamtuner2 you can configure different audio players for different audio formats (MP3 or OGG). In the Apps section of the settings dialog, you can associate one player with each audio file (MIME) type. Nowadays you can often configure the same player for all audio (and even video) types.