/**
 * Implement hook_menu
 */
function thing_menu() {
  $items = array();

  $items['user/%user/edit/tag'] = array(
   'title' => 'Tag details',
   'page arguments' => array('user', 1),
   'access arguments' => array('access tag'),
   'type' => MENU_LOCAL_TASK,
   'file' => 'user.pages.inc',
   'file path' => drupal_get_path('module', 'user'),
  );

  return $items;
}