You can see the Preferences (on OSX) in The LW Menu Tools->Options on the Mac or PC (which version of Windows?).

If (big if) you can see one file, you can click on it and use "Browse Host" to see up to 3000 others.

If no "blue" colored files show up when you try a search for a file that you know is on the other machine, see the diagram about NAT on http://www.kurtm.net/gnuchowto/ If the terms and concepts of the diagram makes sense, good. If not, Ursula is so right--configuring a home network is much better done by Messenger or email.