Ok, you got logged in just fine. That part is easy. But you want to change your username, or your password, or you notice that there's something odd about the time showing when you post a blog or story.

When you are logged in, you'll see a menu with your username and some menu items below. Here is my "admin" log-in, and the things I'm allowed to do (actually, as admin, I can do anything bwaa haa haa, but I'm choosing to be modest for the sake of education).