Click on 'My Profile' (up at the top of the screen in the dark brown area)

(make sure you're logged in too)

There's an area for your email address. Type in any changes... then scroll down and click on 'apply'.

That's all there is to it.

(if you run into problems.. let me know. Some people have more than one user registration with the same email addy.. this will confuse the system and prevent any email updates... in that case I need to go in and change the email addy.)