You need to send them a copy of your passport or alien registration card (for foreigners living in Korea). Since I’m Korean but a US Citizen living in Korea, I just finished signing up and emailed a scan of my USA Passport. **UPDATE ON 4/30/14** I heard from overseas Airens that they are charging a fee. It costs $1.06 per 5 votes. I am surprised this didn’t pop up on my screen when I registered.