For your firewalls you can find instructions to allow LW access here: http://www.limewire.com/english/content/firewalls.shtml
For your router you can hopefully find your model here: http://portforward.com/routers.htm

For LW you will need to Force IP & Force IP instructions are here

If you are going to use LW on more than one computer then I suspect you will need to forward a different port number for LW for each computer that uses LW. I presume you'd do that 'from' each separate computer to your router.

Murasame you were quick! lol