You should use some other commenting plugins. I'd suggest you check out the wpDiscuz plugin. It's a native comment system and it's also created by gVectors.com team. 

You can try it here: https://wpdiscuz.com/demo/

My question is simple, can I use it that outside of the forum, I mean use it in other wordpress pages so that users can comment in the same way as in the forum.

When i say comment box, i want to say this: