What you ask for, requires files customization what in reference to Item Support Policy is not allowed. So if you want to modify files and don't know how, you should contact with your web developer. Or if you don’t have any, fell free to contact with our colleagues who offer such service via https://sweetwp.com/ - we strongly recommend those guys as they know BeTheme product very well.
Comments
as far as we know, builders are unavailable for those kind of pages.