BASE URL http://www.vintageeroticfiction.com
BASE PATH /links

2 things to keep in mind.
1 The index.php in your link above does nothing except forward yoru browser to the actual script.

2 The actual script is "directory" although it looks like it's an actual directory in the URL, it is in fact a PHP script. The directive in the included .htaccess file tells your web server to run the file as a PHP script, despite it lacking a .php file extension.

So, once you've finished customizing, you'll want to link to your installation using the actual script in the url

in your case.. that's http://www.vintageeroticfiction.com/links/directory/