SEO

How do I create Headers in Intuit websites? I am trying to setup SEO and it says I dont have H1, H2, H3, H4, H5, or H6. How do I get these? Also How do I create a robots.txt file? and how do you create an XML sitemap? And last how do you make the website Mobile compatible?

Thanks, I am having a very difficult time setting all this up and would love any help that I receive. Thanks so much.

Brandon