hi, try going onto
http://www.apple.com/support/ipod/ Whenever I have a problem with my ipod I always get it sorted on the site. I know there is a way of manually adding music but I've never needed to do it so I honestly don't know how. if you still have no luck there is a discussion section which is accessible on the support site but I just tried logging onto it and it's unavailable at the moment. If you still have no luck try googling it, something's bound to come up! good luck! xxx