disable login form | WordPress.org

Hi there!

You can only redirect unlogged users the users from the messages page to your login page. This is example of code how to do it:

add_action( 'template_redirect', 'my_redirect_if_user_not_logged_in' );

function my_redirect_if_user_not_logged_in(){
    $page_id = 8437; // Messages page ID
    if ( ! is_user_logged_in() && is_page($page_id) ) {

        $link = add_query_arg('redirect', urlencode(get_permalink($page_id)), 'https://youwebsite.com/login/');
        wp_redirect( $link );
        exit;
    }
}