what does publish mean?
You can add songs to playlists you create and if you want others to be able to see your playlists you can "Publish" them to be made public. Then anyone searching you on Spotify can listen to your playlists and even subscribe to them. But, again, this is optional.
now to find this radio function...
It's on the left side. You listen to the radio based on an artist, like on Pandora. I like to star my favorite songs to listen to later (starring songs creates its own playlist) and then listen to albums of artists I star later as well.
--
Dark Defender