How do I make playlists show up like the Demo?

From subsonic.org, there is a demo server. On the demo site, there are playlists listed at the top of the folders/shortcuts on the far left of the screen. I can't seem to find how to do that. Even when I include m3u and my playlists folder, all it does is show the playlist but won't 'populate' my player with the content of the playlist. I saw it working on the demo.
A little help please?
A little help please?