change the link

add_action( 'wp_footer', function () {
    ?>
    <script>
        (function() {
            let login = 'https://theloginpage.com',
                register = 'https://theregisterpage.com';
            document.querySelectorAll('[href="#jeg_loginform"]').forEach(function(value){
                dupes = value.cloneNode(true);
                dupes.href = login;
                value.parentNode.replaceChild(dupes, value);
            });
            document.querySelectorAll('[href="#jeg_registerform"]').forEach(function(value){
                dupes = value.cloneNode(true);
                dupes.href = register;
                value.parentNode.replaceChild(dupes, value);
            });
        })();
    </script>
    <?php
}, 100 );