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I'm quitting with Google mail, but I cannot edit my address to my new one (first time I logged in with Google-login).
Just says "oops, there was an error".
If you try now, you should be able to do that. We had some server issues.
To change your choice of logins:
Head to your user page.
Then, click the "my logins" button:
Click the "Add more logins..." button.
Then just add a login from the list here: