What’s the default login URL by the way?

I have created a page and used clean login shortcodes to login to my website. The page is here. Although, it seems that I can still login hrough wp-login.php and some plugin are using wp-login.php as the default login URL. For example, here is a course and someone must be logged in to enroll into the course. So if someone clicks “ENROLL NOW” button, he will be taken to the login page and will be automatically redirected back to the course after login. But instead of going to the clean login page, it is taking to the wp-login.php page.

I don’t want my users to get confused between these two login pages. Is there any way the page having clean login shortcodes will be the default page for log in??

Previously I used Theme My Login and it did use the front end page as default login page.

Thank you.

The page I need help with: [log in to see the link]