Help with formatting text

Hello,

I’ve tried looking everywhere but none of the solutions are applicable to my site. I’m assuming it has something to do with my theme?

Anyway, my text formatting (heading 1, heading 2, etc) works in my CP but when I post the article and view it, the new formatting doesn’t show up on the live post. All fonts stay the same size.

I’m not so good with code so please be considerate. How can I fix this so my text formatting shows up on the live posts?

peterbabiy.com/my-stay-at-nyc/