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.
Note: you cannot reach the SSO (Single Sign On) profile page following the "Profile" link when you are on the forum, because the standard toolbar is replaced with the forum one. This is a UX design flaw that will be fixed with the next website redesign.