シンプルな認証と承認のアプリケーション

###前提・実現したいこと
CakePHP2のブログチュートリアルの
https://book.cakephp.org/2.0/ja/tutorials-and-examples/blog-auth-example/auth.html

を実装したいのですが、うまくいきません。

###発生している問題・エラーメッセージ

http://localhost/cake/users/add
で追加したユーザー名とパスワードを
http://localhost/cake/users/login
に入力しても、この画面のままになってしまい、
記事の投稿などが出来ません。

あと、$this->log()をしたいのですが、
具体的にどこに書いてどこから見ればいいのかがわかりません。


```ここに言語を入力

UsersControllerのコードです。


<?php


App::uses('AppController', 'Controller');

class UsersController extends AppController {

//....

  public function beforeFilter() {
      parent::beforeFilter();
      // ユーザー自身による登録とログアウトを許可する
      $this->Auth->allow('add', 'logout');
  }

  public function login() {
      if ($this->request->is('post')) {
          if ($this->Auth->login()) {
              $this->redirect($this->Auth->redirect());
          } else {
              $this->Flash->error(__('Invalid username or password, try again'));
          }
      }
  }

  public function logout() {
      $this->redirect($this->Auth->logout());
  }

    public function index() {
        $this->User->recursive = 0;
        $this->set('users', $this->paginate());
    }

    public function view($id = null) {
        $this->User->id = $id;
        if (!$this->User->exists()) {
            throw new NotFoundException(__('Invalid user'));
        }
        $this->set('user', $this->User->findById($id));
    }

    public function add() {
        if ($this->request->is('post')) {
            $this->User->create();
            if ($this->User->save($this->request->data)) {
                $this->Flash->success(__('The user has been saved'));
                return $this->redirect(array('action' => 'index'));
            }
            $this->Flash->error(
                __('The user could not be saved. Please, try again.')
            );
        }
    }

    public function edit($id = null) {
        $this->User->id = $id;
        if (!$this->User->exists()) {
            throw new NotFoundException(__('Invalid user'));
        }
        if ($this->request->is('post') || $this->request->is('put')) {
            if ($this->User->save($this->request->data)) {
                $this->Flash->success(__('The user has been saved'));
                return $this->redirect(array('action' => 'index'));
            }
            $this->Flash->error(
                __('The user could not be saved. Please, try again.')
            );
        } else {
            $this->request->data = $this->User->findById($id);
            unset($this->request->data['User']['password']);
        }
    }

    public function delete($id = null) {
        // Prior to 2.5 use
        // $this->request->onlyAllow('post');

        $this->request->allowMethod('post');

        $this->User->id = $id;
        if (!$this->User->exists()) {
            throw new NotFoundException(__('Invalid user'));
        }
        if ($this->User->delete()) {
            $this->Flash->success(__('User deleted'));
            return $this->redirect(array('action' => 'index'));
        }
        $this->Flash->error(__('User was not deleted'));
        return $this->redirect(array('action' => 'index'));
    }

}

?>

add.ctpの中身です

<div class="users form"> <?php echo $this->Form->create('User'); ?> <fieldset> <legend><?php echo __('Add User'); ?></legend> <?php echo $this->Form->input('username'); echo $this->Form->input('password'); echo $this->Form->input('role', array( 'options' => array('admin' => 'Admin', 'author' => 'Author') )); ?> </fieldset> <?php echo $this->Form->end(__('Submit')); ?> </div>