How to change author url

You can leverage the feedzy_author_url filter in order to change the default format of the author url. 

Here is a code snippet that you can add in your functions.php of your theme/child theme to achieve this.

function tifd_feedzy_change_author( $author_url, $feedURL ) {
       	     $author_url = "new url";
             return $author_url;
}
add_filter( 'feedzy_author_url', 'tifd_feedzy_change_author', 10, 2 );