Function to change Register Button link

gistfile1.txt

function paid_membership_pro_registration_url() {
    $url = 'The_url_of_your_levels_page';

    return $url;
}
function paid_membership_pro_register_btn() { ?>
    <script type="text/javascript" id="paid_membership_pro_register_btn">
        jQuery( document ).ready( function( $ ) {
            "use strict";
            var url = '<?php echo paid_membership_pro_registration_url(); ?>';

            $( '.logged-out #thrive_nav #user-nav-user-action > a:nth-child(2)' ).attr( 'href', url );

        });
    </script>
<?php }
add_action( 'wp_footer', 'paid_membership_pro_register_btn' );