easiest way is to find the "Direct Connect" tab on the Search page of LimeIWre.

The tab is one of the three Search Types (Keyword, What's New, and Direct Connect"

If you aren't firewalled, the instructions there will show your IP and port that you can send your friends.

If it doesn't show, it will be more difficult for your friends to connect directly to you.

Search for the detailed post (with pics) by Lord of the Rings under "Direct Connect" to get better information.

OR

just go to www.whatismyip.com to see your IP number