Thanks for the suggestions. I did not make the /blog/ folder before the Fantastico install. Instead I told the WordPress dashboard that’s where I wanted the page to be during the initial set up. I’ll try deleting everything and installing again, and if I understand corectly, I’ll make the /blog/ folder as part of the reinstall, when I tell Fantastico where to put everything?
Does it matter that I can see the page now if I type in https://www.port-manteau.com/index.php? Does this mean that I just need to shift some files around? And if so, where?