Captcha Security for Item Comment Form Osclass

Osclass item comment form is lack of Captcha security…How to integrate captcha security for this section? I have clonned / copied

<?php osc_show_recaptcha(); ?>

from user-register.php, but it does not working…no function!

did you configure captcha or akismet?

Captcha doesn’t work on comment form, it is there for contact form. We need make some changes for that.

Yes, I configured of course, but spam registration not solved.
Finally I have installed **[Advanced CAPTCHA] plugin of WEBMODS,
Now spam registration stopped.