Caroline : Go here :
https://www.grc.com/x/ne.dll?bh0bkyd2
Your external ip address is in the bottom paragraph 2 lines from the end (assuming you're using the default proxy)
Then click on Ignitions name and select private message ignition and send him the i.p. address.
-Edit- Daniel beat me to it. Nice link, been looking for a a clearer one that doesn't just display the cache ip. thanks.