$this->getEventManager()->trigger('init', $this);

MyForm extends ZfcUserFormRegister {
    public funtion init(){
        $this->add(array(
            'name' => 'first_name',
            'options' => array(
                'label' => 'First Name',
            ),
            'attributes' => array(
                'type' => 'text'
            ),
        ));

        $this->add(array(
            'name' => 'last_name',
            'options' => array(
                'label' => 'Last Name',
            ),
            'attributes' => array(
                'type' => 'text'
            ),
        ));
    }
}

public function getServiceConfig()
{
    return array(
        'factories' => array(
            'myform' => function ($sm) {
                $form = new MyForm(null, $options);
                return $form;
            },
        ),
    );
}