The user signup stuff in the comments has been broken for a long, long time. It accepted users that already existed, but not new ones. I have finally fixed this, and added the users that have set themselves up in the system since it stopped working. You should be able to sign up to create users and also to change those users' passwords, from now on.
If you've already made a user, but don't remember the password for it, feel free to email me, and I'll reset your password.
Thanks for bearing with me in my period of extreme laziness.