Go to Library, click on the song (highlight), click enque, click Save as. It going to have a Limewire file popup but scroll down on it to my computer, shared documents then shared music then save from there.The file should come up in Shared Music as a Window Media Player (or whatever is your default player) file that titled Limewire. Retitle it with the Song-Artist name and from there you can plug in your MP3 to access it from the Media Player files. Hope this helps.
Good Luck!
Ric