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public function displayForm()
{
    // Get default language
    $default_lang = (int)Configuration::get('PS_LANG_DEFAULT');
    
    // Init Fields form array
    $fields_form[0]['form'] = array(
        'legend' => array(
            'title' => $this->l('Settings'),
        ),
        'input' => array(
            array(
                'type' => 'text',
                'label' => $this->l('Configuration value'),
                'name' => 'MYMODULE_NAME',
                'size' => 20,
                'required' => true
            )
        ),
        'submit' => array(
            'title' => $this->l('Save'),
            'class' => 'buttonbtn btn-default pull-right'
        )
    );
    
    $helper = new HelperForm();
    
    // Module, token and currentIndex
    $helper->module = $this;
    $helper->name_controller = $this->name;
    $helper->token = Tools::getAdminTokenLite('AdminModules');
    $helper->currentIndex = AdminController::$currentIndex.'&configure='.$this->name;
    
    // Language
    $helper->default_form_language = $default_lang;
    $helper->allow_employee_form_lang = $default_lang;
    
    // Title and toolbar
    $helper->title = $this->displayName;
    $helper->show_toolbar = true;        // false -> remove toolbar
    $helper->toolbar_scroll = true;      // yes - > Toolbar is always visible on the top of the screen.
    $helper->submit_action = 'submit'.$this->name;
    $helper->toolbar_btn = array(
        'save' =>
        array(
            'desc' => $this->l('Save'),
            'href' => AdminController::$currentIndex.'&configure='.$this->name.'&save'.$this->name.
            '&token='.Tools::getAdminTokenLite('AdminModules'),
        ),
        'back' => array(
            'href' => AdminController::$currentIndex.'&token='.Tools::getAdminTokenLite('AdminModules'),
            'desc' => $this->l('Back to list')
        )
    );
    
    // Load current value
    $helper->fields_value['MYMODULE_NAME'] = Configuration::get('MYMODULE_NAME');
    
    return $helper->generateForm($fields_form);
}