To update your email address:

1. On nanowrimo.org, sign in. In the main navigation bar, you should see a link that reads "Hi, [YOUR USERNAME]. 
2. Click on this link, then, in the dropdown menu that appears, select "Settings".
3. On the Settings page, under the "Accounts" tab, you'll see a field that shows your current username and email address.
4. Enter your new username or email address in the appropriate field.
5. Press the "Save Changes" button.
6. You should then receive a confirmation email in your new email address inbox. Once you've confirmed through that email, you're good to go!