The file extensions and file or folder names should tell you what kind of website you're dealing with. Once you know that, it becomes a question of editing that

The file extensions and file or folder names should tell you what kind of website you're dealing with. Once you know that, it becomes a question of editing that specific kind of website. It might have some built-in editing functionality, as 'markx2 suggests. Or it might require editing code, in which case hiring someone to do it for you, as 'nobankai says, would get the job done quickest. But if you want to learn how to do it yourself, you should also be able to find editor software and tutorials with a targeted search for that kind of website.