Where can I find my user name? Why can't I log in with my username anymore?
In the past you could log in to the webapp with your user name.
Today, there are no more usernames.
Instead, you can login with your mail address. If you have forgotten which mail address you used to register, please contact us at firstname.lastname@example.org.
You want to change your account name instead? You can change it in the account settings.