Hi there! I have fixed this for you. The issue was that you had changed your "Front Page" settings to displaying a "Static Page" but you didn't actually pick which page to display. I set it so that it displays your most recent posts. For reference, you can learn how to do that here:
http://en.support.wordpress.com/pages/front-page/
If you're just starting out with WordPress.com, I recommend you go through our new user's guide: http://learn.wordpress.com/
In 10 quick steps, you'll learn about all the best and most useful features of WordPress.com, with lots of screenshots and videos.
Hope this helps.