On the top bar click on "Main site", and when you see the main page, click on "Profile". On the profile page you should see a "change" link just on the left of the email.
This is a UX design flaw that will be fixed with the next website redesign.
UP ! How can I change the notification email used in the forum? I can't... I can change the login email in the main profile, but the notification email is not changed and is not updatable.This is really annoying...
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via Egeo 16