Answer: The guys with the gold highlighted names in the 'Fight' page are the champs. When you feel ready challenge them to a regular fight and if you win, clear off your mantle. Or, if the org's champ has vacated the title, an automatic challenge is sent out to the top 5 or 6 guys in that org at that weight, and the first two to accept fight for the new title.
The server does this every day, always worst around refresh times. I think MKick is upgrading to a better one, hopefully at least. Just keep refreshing and it'll work eventually.