LMS Ubuntu help, please!

Hi,
I feel really out of my depth here.
I have just installed Logitech Media Server on a netbook running Ubuntu.
I have managed to install it OK, and can stream Spotify etc.
However, it only runs on the web interface, and I can't find out how to get it to scan and find my own music, which I have loaded into the Music folder in Ubuntu.
Any help gratefully received.
Cheers,
John.