genesis-footer-back-to-top.php

<?php
// remove the <?php before pasting into funtions.php

add_filter('genesis_footer_creds_text', 'sp_footer_creds_filter');
/**
 * @author  Aditya Raj
 * @link    https://wprumors.com/author/aditya
 */
function sp_footer_creds_filter( $creds ) {
$creds =  '[footer_copyright] &middot; <a href="http://mydomain.com">My Custom Link</a> &middot; Built on the <a href="http://www.studiopress.com/themes/genesis" title="Genesis Framework">Genesis Framework</a> &middot; <a href="#">' . __( 'Back To Top' ) . '</a>';
return $creds;
}