Hello Frosticek,
As per instructions the code is to be placed in between <form> tags.

1) Publish new listing - in oc-content/themes/zara/item-post.php into form with name="item" - DONE
2) Add new comment - in oc-content/themes/zara/item.php into form with name="comment_form" - No such Form Name
3) Contact seller - in oc-content/themes/zara/item.php into form with name="contact_form" - DONE

In my item.php page there is no form with the name - "comment_form"
So where should I insert the code to enable Anti-Bot JavaScript Control for new comments.
I would greatly appreciate it if you kindly give me some advice.

Thank You.