Default Comment System

Can you clarify a little more what you mean when you say:

comment lane ‘WordPress Comments

I want to delete ‘wordpress’ on this https://i.imgur.com/qGIA56w.jpg. Just want ‘comments’ left or I want to change it ‘My website comments’ kind…

What theme are you using? Where did you get it from? Odds are you may have to create a child theme to remove that. Not all themes are structured the same way so it is not easy to know from a screenshot.

I bought this theme: https://themeforest.net/item/fast-forward-faster-than-light-content-sharing/7683390

That’s not a theme we have access to (or want access, truth be told). For that modification you really are best off asking the theme author.

For pro or commercial product support please contact the author directly on their site.

https://cosmothemes.zendesk.com/home

As the author is aware, commercial products are not supported in these forums. As you are their customer I am sure they will have no problem supporting you there.