You put them into
iTunes (this is a link. Click it), then, from iTunes you get them into iPod.
To get them into iTunes, you either enable iTunes support (if you are using the latest Limewire beta
or a Mac only), or you go to C:/Program Files/LimeWire/Shared (for Windoze) or Home directory/Shared (for OS X. It would have been much easier if you specified what you had
) and open iTunes, then drag-and-drop the songs from the Shared into iTunes. You then get them into iPod.
Choosing the first option (if it is available for your set-up), means that you have to manually drag-and-drop them anyway because enabling iTunes support only imports subsequent dlds into iTunes' library (this means that all previous dlds stay were they are and you have to import them yourself).