If you ever need to change your email address again, just click on "Log out?" link on the right hand column, when you reach that page do NOT click on the "Log out" button--click the Profile tab which will take you to a page that has all your registered info. From there change your email address to whatever you want it to be and click on the submit changes button. Once you have done that you will be required to confirm your new email address and once you've done that, it's business as usual.
Hope this helps.