menu.ctp

			<li class="nav-item">
                <?= $this->Html->link(__('Sign Up'), ['controller' => 'Users','action' => 'affe','prefix' => false], [
                    'class' => 'nav-link'
                ]) ?>
			</li>

routes.php

Router::scope('/', function (RouteBuilder $routes) {

    $routes->connect('/affe', ['controller' => 'Users', 'action' => 'affe', 'prefix' => false]);

    $routes->fallbacks('DashedRoute');
});

UsersController.php

    public function affe()
    {
     
    }