If you have a different login page to admin panel, not wp-login.php.
1. go to wp-includes/general-template.php find all names your login page (ex. yoursupersecretpage.php) change all to wp-login.php.
2. go to your wordpress path /public_html, find your old yoursupersecretpage.php page and remove it.
3. now your login adress yoursite/wp-login.php
Good luck!