Presumably you're talking about a search element in one of the template designs.
Bootstrap Studio builds static, "front-end" websites. Blogs and search capabilities require a database and the ability to search the database using back-end functionality. Boootstrap Studio does not do this. The "search" you are seeing in the website design is for appearance only. To make it functional, you would have to create the back-end and code to "connect" it all together.