Remove WordPress Sub Directory from Url

Thanks for the link. I have already tried putting the following code in the index.php file located in the root.

<?php
define(‘WP_USE_THEMES’, true);
define(‘WP_IN_ROOTDIR’, true);
require(‘/wordpress/wp-blog-header.php’);
?>

It still shows the wordpress directory in the url.

I am unable to change the Site address (URL): under general settings.
I get a message saying that I shouldn’t change this field.

Is is currently set to http://www.mysite.com/wordpress

That’s the thing – I want to keep the files in the wordpress directory not in the root.
Will that not work?

Thanks for the suggestion but I don’t see cpanel-> Domain Section -> within Yahoo web hosting.