I see that you signed up for a blog user account but did not actually create a blog yet. Go to http://3fatchicks.com/diet-blogs/wp-blogsignup.php and you should be able to create the blog from there. Once you have created your own blog you'll be able to access all of the options to choose a theme and get started.
Lynn, Tech was not able to fix the corrupted blogs but we're trying an alternative route of exporting your current blog and importing it into a new one. I just finished one for Devnet and it seems to work (her new url is not public yet) I'll work on yours next and will PM you with the new login and url