Error: Call to a member function execute() on string

I am trying to send the form’s data to admin panel from phtml. However, it returned an error for the HTML form’s class, how can I run the php function for passing data to html and send it to admin?

Myvendor/Mymodule/Controller/Index/Send.php

<?php
 namespace CleargoProductEnquiryControllerIndex;
 use MagentoFrameworkAppActionContext;
 use MagentoFrameworkMailTemplateTransportBuilder;
 use Zend_Mail_Transport_Sendmail;

 class Send extends MagentoFrameworkAppActionAction{

/**
 * Recipient email config path
 */
const XML_PATH_EMAIL_RECIPIENT = 'email_section/sendmail/email_section_sendmail_email_template';
/**
 * @var MagentoFrameworkMailTemplateTransportBuilder
 */
protected $_transportBuilder;

/**
 * @var MagentoFrameworkTranslateInlineStateInterface
 */
protected $inlineTranslation;

/**
 * @var MagentoFrameworkAppConfigScopeConfigInterface
 */
protected $scopeConfig;

/**
 * @var MagentoStoreModelStoreManagerInterface
 */
protected $storeManager;
/**
 * @var MagentoFrameworkEscaper
 */
protected $_escaper;
/**
 * @param MagentoFrameworkAppActionContext $context
 * @param MagentoFrameworkMailTemplateTransportBuilder $transportBuilder
 * @param MagentoFrameworkTranslateInlineStateInterface $inlineTranslation
 * @param MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig
 * @param MagentoStoreModelStoreManagerInterface $storeManager
 */
public function __construct(
    MagentoFrameworkAppActionContext $context,
    MagentoFrameworkMailTemplateTransportBuilder $transportBuilder,
    MagentoFrameworkTranslateInlineStateInterface $inlineTranslation,
    MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig,
    MagentoStoreModelStoreManagerInterface $storeManager,
    MagentoFrameworkEscaper $escaper
) {
    parent::__construct($context);
    $this->_transportBuilder = $transportBuilder;
    $this->inlineTranslation = $inlineTranslation;
    $this->scopeConfig = $scopeConfig;
    $this->storeManager = $storeManager;
    $this->_escaper = $escaper;
}

/**
 * Post user question
 *
 * @return void
 * @throws Exception
 */
public function execute()
{
    $post = $this->getRequest()->getParams();
    if (!$post) {
        $this->_redirect('*/*/');
        return;
    }

    $this->inlineTranslation->suspend();

    try {
        $postObject = new MagentoFrameworkDataObject();
        $postObject->setData($post);

        $error = false;

        $sender = [
            'name' => $this->_escaper->escapeHtml($post['name']),
            'email' => $this->_escaper->escapeHtml($post['email']),
        ];

        $storeScope = MagentoStoreModelScopeInterface::SCOPE_STORE;

        $transport = $this->_transportBuilder
            ->setTemplateIdentifier('email_section_sendmail_email_template') // this code we have mentioned in the email_templates.xml
            ->setTemplateOptions(
                [
                    'area' => MagentoFrameworkAppArea::AREA_FRONTEND, // this is using frontend area to get the template file
                    'store' => MagentoStoreModelStore::DEFAULT_STORE_ID,
                ]
            )
            ->setTemplateVars(['data' => $postObject])
            ->setFrom($sender)
            ->addTo($this->scopeConfig->getValue(self::XML_PATH_EMAIL_RECIPIENT, $storeScope))
            ->getTransport();


        $transport->sendMessage(); ;
        $this->inlineTranslation->resume();
        $this->messageManager->addSuccess(
            __('Thanks for contacting us with your comments and questions. We'll respond to you very soon.')
        );

    } catch (Exception $e) {
        $this->inlineTranslation->resume();
        $this->messageManager->addError(
            __('We can't process your request right now. Sorry, that's all we know.'.$e->getMessage())
        );

    }

    return $this->_redirect($this->_redirect->getRefererUrl());
}

}

Myvendor/Mymodule/view/frontend/templates/popup.phtml

<?php

/**
* @var MyvendorMymoduleControllerIndexSend $myBlock2
*/

$block3 = $myBlock2->excute();

?>

<div class="content" style="display:none" id="popup_content">
<form
    class="form enquire"
    id="enquire-form"
    action="<?php $block3 ?>"
    method="post">
    <label for="name">Name:</label> <br>
    <input id="name" name="name" type="text"><br>
    <label for="email">Email:</label> <br>
    <input id="email" name="email" type="email"><br>
    <label for="message">Message:</label> <br>
    <input id="message" name="message" type="text"><br>
    <label for="product_name">Product Name:</label> <br>
    <input id="product_name" name="product_name" type="text"><br>
    <br>
    <button type="submit">Submit</button>
</form>

Myvendor/Mymodule/view/frontend/email/email_file.html

{{template config_path="design/email/header_template"}}

   <table class="message-details">
    <tr>
           <td><b>{{trans "Name"}}</b></td>
    <td>{{var data.name}}</td>
</tr>
<tr>
    <td><b>{{trans "Email"}}</b></td>
    <td>{{var data.email}}</td>
</tr>
<tr>
    <td><b>{{trans "Product Name"}}</b></td>
    <td>{{var data.product_name}}</td>
</tr>
  </table>
  <p><b>{{trans "Comments"}}</b></p>
  <p>{{var data.message}}</p>

  {{template config_path="design/email/footer_template"}}