You may want to fill that out, but you most certainly do not need to. No separate application is required for the Presidential Scholarship - that’s awarded automatically based on the GPA and ACT/SAT scores you submit with your application for admission.
The scholarship application referenced in Post #10 above is necessary only if you want to apply for additional scholarships. There are all sorts of those - for children of alumni, students who live in this or that county in Alabama (or elsewhere). You name it - there’s probably a scholarship for it! The application will ask you all sorts of questions to see which of the scholarships you might qualify for. But if you don’t want to do it, you don’t need to - it will in no way impact your receipt of the Presidential scholarship.