Sharing

I'm having trouble sharing files and don't want to be a freeloader. For a computer novice, what should I do? I used the Sharing tab under Preferences and indicated the pathway for my folder. It is located in my iTunes music folder. I can pull it up in the silect directory window and it shows all of my music files, but they aren't highlighted. If I push select, nothing is added. All my downloaded files go to my iTunes music folder, not to the Library in Limewire. Can I add these files to be shared? How can I add all of the files in my iTunes as well? I searched for a similar thread and didn't find anything. Thanks from a computer idiot.