Hi.
To begin with, did you enable the song request feature in the bot? If you haven't, check the "Enable Song Requests" found in the Music tab. With that enabled you should then be able to request a song from Twitch chat using either the full Youtube link or the random characters after the "v=". For example to play
http://www.youtube.com/watch?v=uFj60cLeGJI (Which is Tetris - Theme 'B' Acapella by Smooth McGroove) you would do the following
!requestsong http://www.youtube.com/watch?v=uFj60cLeGJI
OR
!requestsong uFj60cLeGJI
With that, the music should automatically begin playing from within the interface. If it doesn't, the next step should fix that
Assuming you already know how to add a song from the interface to get it to begin playing (Again, if it automatically doesn't) press the "play" button that is found under where the video is located. The following screenshot should show you what it should look like after you've done this.
Hope this helps,
Dante557