It will go to it IF that is what they selected when they created their blog. A lot of people aren't using their forum names, they are using various words.
When you sign up, you'll be asked to create a blog name, which is really just the part that goes in the URL. 3fatchicks.com/diet-blogs/name/ And that part never changes. Then you'll be asked to create a title for your blog, which appears at the top of the page. You can change the title later if you want. So someone could create 3fatchicks.com/diet-blog/susie/ (or /diet-blogs/susiesplace/ etc)then at the top of the page it might say Susie's Fabulous Blog or My Diet Universe or Fluffy's Big Adventure. That's the blog 'title'.
If you are looking for someones blog then you are kind of at their mercy, lol. Maybe they chose something unrelated and you can't figure out who they are. If they update it frequently, then their blog title will appear on the list of recently updated blogs.
Hopefully people will start linking them in their forum profile.