OK, so I’ve spent pretty much all day hunting for an answer, and managed to find another old thread that suggested renaming .htaccess and OMG it worked. I’m in.
Not 100% sure what the htaccess file does though? I’m more a front-end HTML/CSS nerd than a server-y PHP guru, so if someone can let me know if I need a htaccess file, or what it does, or anything, that’d be great!