Good luck with it.

Just don't forget the colon symbol between IP address & listening port

I can't remember whether chat's enabled by default, so you'd have to check within LW's options.

If you're still stuck after doing all that, delete LW's preferences folder (on both computers) when LW's properly closed.
See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire

This will change all of your settings within tools > options, you'll have to go back through afterwards & reset things.