problems with my community account on www.postgresql.org

Hi there,

I created a community account some weeks ago, mainly to be able to subscribe to this email lists.
Now I want to edit my subscriptions but I am unable to login. I chose Twitter to be used for authentication.
When I do this again, and click on "Sign in with Twitter" I get into an infinite loop which goes to
https://api.twitter.com/oauth/authorize where I can click "Authorize app" but I land on api.twitter.com again and so on.
However, when I try to reset my password for my account using the password reset function on
https://www.postgresql.org/account/reset/ I get "Account error",
"This account cannot change password as it's connected to a third party login site."

Can anybody from the mailing list admins help me out here?
Thanks in advance
Mathias Zarick