The following code can be added to your theme’s functions.php file to remove the RSS feed links from the page head.
// DISABLE RSS FEEDS remove_action( 'wp_head', 'feed_links_extra', 3 ); // Display the links to the extra feeds such as category feeds remove_action( 'wp_head', 'feed_links', 2 ); // Display the links to the general feeds: Post and Comment Feed remove_action( 'wp_head', 'rsd_link' ); // Display the link to the Really Simple Discovery service endpoint, EditURI link remove_action( 'wp_head', 'wlwmanifest_link' ); // Display the link to the Windows Live Writer manifest file. remove_action( 'wp_head', 'index_rel_link' ); // index link remove_action( 'wp_head', 'parent_post_rel_link', 10, 0 ); // prev link remove_action( 'wp_head', 'start_post_rel_link', 10, 0 ); // start link remove_action( 'wp_head', 'adjacent_posts_rel_link', 10, 0 ); // Display relational links for the posts adjacent to the current post. remove_action( 'wp_head', 'wp_generator' ); // Display the XHTML generator that is generated on the wp_head hook, WP version
You may also be interested in: WordPress – How to disable RSS feeds.