It was in the rules somewhere.... (although I forgot about it too and luckily had the ones listed I wanted to send).
E-mail them and ask if you can make the change. They may let you do it - especially if it is not something significant. With how screwed up things were this year, I think they have gone out of their way to help fix any problems they could, as best they can.
Kegged/Serving: Session IPA, Dark Mild, Ordinary Bitter, Blonde Ale
Bottled: Barley Wine, Sour Belgian Golden on Cherries, Sour Cherry Stout
Primary: Dark Mild, Helles
Secondary/Lagering: Alt, Scottish 70, Dortmunder, Bo-Pils
Future Brews: Heady Topper Clone, Session IPA, Hop Fu, Porter, Plain ol American Ale More...... More....... Beer.......