add_action('wp_dashboard_setup', 'dashboard_widgets');

  function dashboard_widgets() {
    global $wp_meta_boxes;

    wp_add_dashboard_widget('custom_help_widget', 'Theme Support', 'dashboard_help');
    }
  function dashboard_help() {
    echo '<p>Welcome! Need help? <a href="mailto:name@gmail.com">here</a></p>';
  }