Select the direct connect tab in limewire, it's located bottom left hand side near keyword and what's new...
It will show you what your IP number is..trade IP's and enter the number into the direct connect box...
One thing you do need to make sure of is that neither of you are behind a firewall or it won't work...So if you see a wall in front of the globe you will need to get rid of it...
If you need help getting rid of the firewall (if you have one) post these details and we will endevour to fix it for you...
System details - help us to help you