I couldn't find the answer on the FAQ's--the only help there was for a lost or forgotten password, which sends the password to the email on file....
For additional information or unresolved board problems, please e-mail the Administrator was all I could find
You need to private message an Administrator. They're the people whose names are in red and the little box says "Admin". Find one and private message them asking to change your email.
But good luck, I asked one to change mine about a week ago and it hasn't been done.