But, I now have to remove this Flarum installation. Ha! I only installed it because I thought the SSO extension would work. I wanted to add a forum to a WordPress site I have. But, I forgot the SSO extension only works on subdomains. And, with this particular site, long story, I can't do a subdomain.
My testament still stands, it was very easy to install Flarum this third time around now that I know what I'm doing. But, the SSO options out there make me sad.