Is there a way to make Zennoposter hit that comment button? There is really no common thing in all the html elements for it, switching to mobile url doesn't help either and I cannot use mouse coordinates because of system ressources.
This is why You have to search for unique search criteria for exactly what you need. https://zennolab.com/wiki/en:action_constructor
Everything depends on logic You require for this click.
Click on the element with right-click and then Inspect Element.
You will see the Element tree. Move around there and work with every criteria until You Find Your needed