Subscribe Buttons

When looking at the details on the product page (highlighted in screenshot) shows as Subscribe RSS / Email button. So we assumed Komento had this functionality so that why we are using it. Now we have it setup we trying to work how to enabled this button to only find this does not seem possible with the current without commenting on the article etc (zoo item in our case). Is this correct?

https://i.imgur.com/Y8qRX31.jpg

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