So basically, I would like to add a search box, but only for my Blog page.
I don’t want it to appear on the rest of my website.
How can I add the search box so the users can search the blog post they are looking for?
theres a few ways to do this. The easiest way would be to add a Search Widget to one of the Sidebars and then in Customizer > Layout > Sidebars enable the sidebar for your Blog and your Posts.