Redirect of register link to /register/ directory

I have been trying to figure out why the register form does not display, but instead a 404 page indicating an error in the URL.

Apparently, wp-login.php?action=register gets redirected to a directory called “register”. This does not exist among the files that I downloaded from WP. THus the reason for the 404. Is there a plugin that provides the files? Or if I create this directory with an index.php file that has a form, will this be the solution? Where would the new registration be stored in the WP database?

I have also tried out adding AJAX Login, however, when I submitted the register form there it apparently entered an infinite loop. Any information would be appreciated.