Plugin displays Captcha for those comments forms which were written in the same way as comments forms for the standard WordPress themes. Unfortunately, the plugin is incompatible with comments forms generated by using SAAS (eg: Disqus or JetPack comments forms). If you don't use SAAS comments forms, please follow the next steps:
1. Using FTP, please go to {wp_root_folder}/wp-content/themes/{your_theme}.
2. Find and open "comments.php" file. It is possible that the file that is used to display the comment form in your theme called differently or comment form output functionality is inserted directly in the other templates themes (eg: "single.php" or "page.php"). In this case, you need to open the corresponding file.
3. Make sure that the file contains one of the next hooks:
do_action ( 'comment_form_logged_in_after' );
do_action ( 'comment_form_after_fields' );
do_action ( 'comment_form' );
If you didn't find one of these hooks, then put the following string in the comment form: <?php do_action( 'comment_form', $post->ID ); ?>
This article related to Captcha by BestWebSoft plugin
Additional resources: Captcha - User Guide
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