Forum:How do you get a ude number

I'm supposed to be intering my first yugioh tourament this july and the deck list paper says you need to write your ude number and I have no idea how to get on plz help me--Badakamaru188 02:06, 4 July 2008 (UTC)Badakamaru188--Badakamaru188 02:06, 4 July 2008 (UTC)