code: public function enableAction()
      {
          $moduleName = (string)$this->getRequest()->getParam('module');
  
          try {
              $this->getService()->setModuleStatus($moduleName, true);
              $this->getService()->flushCache();
              Mage::getSingleton('core/session')->addSuccess('Module was enabled.');
          } catch (Exception $e) {
              Mage::getSingleton('core/session')->addError('Unable to enable module: ' . $e->getMessage());
          }
  
          $this->_redirectReferer();
      }
docs: Enables specified module