Hi, you've summoned the person who knows what's going on!
Essentially, for the last week or two the forum's had an error where new users trying to register get directed to an error page once they register (and are thus unable to make an account). I realised pretty soon that this issue was quite out of my depth software-wise, so yesterday I reached out to Hushpiper, one of the other admins who knows more about how to keep this site running. Hushpiper thought the registration issue might have been because of our lack of a privacy policy, so they've added a privacy policy to the site. Unfortunately, it appears that was not the issue, so we're still trying to figure out how to fix things up so that new users can join. But that's why we have a privacy policy now!