Hi There,
Sorry, for the misunderstanding.
This is not any mistake. It’s a style of our ForumUS style/theme/template.
If you want to add pagination, then you need to hire someone else to customize this for you.
However, if it’s really essential, then we will try to add this to our style in the future/next update. We are listing your issue in our update list.
Best Regards,
ThemeLooks Support Team