This is my first attempt at writing a blog here. It looks easy. Just click on the "Blogdashboard" in the user menu (after you log in of course!).
You get a second webpage with three tabs at the top: Home - Write - View. Click on Write and type away, putting in your title and then the full text.
And don't forget to give your blog a description! If you want tochange the name of your Blog (and your published name - not username) go to your profile page, select "Edit Profile" and change your name.