[SOLVED] Help with post titles

Hi -
I've poked around the forums but can't quite find the fix I need, and I really am not as knowledgeable about playing with the coding so I'm afraid to break my site (true story, has already happened twice and I am a BAD girl!).
I've done everything I can think of to make my post titles appear at least the same size or a little bigger than my H1 headings within the posts themselves. I have to assume I'm doing something insanely simple wrong since this is a basic kind of thing.
Could someone look at http://www.katscafe.org and let me know if you can tell why my post titles aren't showing up the way I want them to?

Much thanks ahead of time for your time and effort,
Katrina "Kat"