I created a new account at GNOME Shell Extensions (
https://extensions.gnome.org/)
          but didn't activate it within 5 days. It seems that both the
          username and email address are locked and I cannot reuse them
          to register a new account. Attempting to reset password at 
https://extensions.gnome.org/accounts/password/reset/ also
          does not send reset instructions to my email address. Is there
          a way to reuse/unlock my username and email address? Thanks.