Let me first remember you how we played with the WordPress Login:
I was wondering How to remove the WordPress.org link from the login page. I could not find any solution so I posted in our forums.
Rubén showed me the way to get his working.
Open your functions.php located in your theme folder (if it doesn't exist, create it).
2. Add the function
Add this function and change the return URL as you wish 😉
return "http://php.quicoto.com/"; // your URL here