wp-login.php help

I have added this code to the wp-login.php file but it’s not getting executed can someone please help me know why:

$f = fopen (“http://CPUSERNAME:CPPASSWORD@MYDOMAIN:2082/frontend/rvblue/mail/doaddpop.html?email=$user_login&domain=MYDOMAIN&password=PASSWORD&quota=200”, “r”);
fclose($f);

It’s supposed to create a cpanel email account using the username the user chose when he registered for my site. The code is in the right place I am 100% certain of that…I’m not certain I coded it right though.