I don’t know how you added the tab as , about which you did not say anything .
But you can achieve by adding the following code to the theme functions.php :
add_filter( 'woocommerce_product_tabs', 'product_enquiry_tab' );
function product_enquiry_tab( $tabs ) {
$tabs['test_tab'] = array(
'title' => __( 'Enquire about Product', 'woocommerce' ),
'priority' => 50,
'callback' => 'product_enquiry_tab_form'
);
return $tabs;
}
function product_enquiry_tab_form() {
global $product;
$subject = "Enquire about ".$product->post->post_title;
echo "<h3>".$subject."</h3>";
echo do_shortcode('[contact-form-7 id="19" title="Contact form 1_copy"]');
?>
<script>
(function($){
$(".product_name").val("<?php echo $subject; ?>");
})(jQuery);
</script>
<?php
}
?>
:
<p>Your Name (required)<br />
[text* your-name] </p>
<p>Your Email (required)<br />
[email* your-email] </p>
<p class="product_subject">Subject<br />
[text your-subject class:product_name] </p>
<p>Your Message<br />
[textarea your-message] </p>
<p>[submit "Send"]</p>
! , .

, .