Where do you go in Trello to update or change your email address?
The Account section only shows you this part in the avatar section:
We're using email@example.com. It may take time for changes made on gravatar.com to appear on our site.
And below that it allows you to set the email notifications.
Beyond that, there doesn't seem to be a link or a field that you can update your Trello account to a new email address.
Where does the magic happen?