emmac6 on "how can I reset the theme?"

Hello, I totally goofed while trying to set my blog as a website - I have done it successfully for another wordpress blog, but for whatever reason I messed up big time with this one: http://mylanguages4u.wordpress.com/. As you can see, the default Home page is gone! How can I recover it? As I have basically nothing yet on this site, I would like to restart it from scratch and keep of course the name. How can i do that?
I ended up goofing, because I was trying to edit the Home page but could not see it in the list of my pages on my dashboard. why is that? Any help welcome. Thanks