So you need help?
When listening on a channel, there are some different buttons you can click.
If you click the cogwheel, you'll open the settings panel. Here you can change channel settings, decide if you want the computer you're on can be remote-controlled, and import playlists from YouTube.
The search-icon, opens up a search inputfield. If you start typing here, the site will automagically search for your input!
If you click the button next to the search icon, you'll skip on a song. The one next to that one, is shuffleling of the list. Next one there again is to open the chat.
Clicking a song in the playlist, gives it a vote. If you're logged in, you'll have a delete button at your disposal.
Also, whenever you're logged in, you'll have two tabs in the top of the playlist thats called "Playlist" and "Suggested". The playlist obviously shows the playlist. But the suggested tab, shows 5 songs that YouTube recommends based on the current song. There might also be user recommended songs. To add any of these, just click them as you'd click a song to vote.