Logins and registrations are disabled.
A lot of things broke a while ago with a server upgrade and I don't have the time right now to try to fix them, and the forum data is too old to be migrated to the latest version.
As you can see, nobody has been able to post for a while. Thankfully hosting is cheap these days, so I'll keep the forum up in read-only mode for posterity for as long as it keeps working well enough for that. I may install a new forum or something else at some point, but right now I don't have any immediate plans for the site.