If you aren't logged in, there's a thin row at the top that says
Welcome to Sondheim Forum. Please login or sign up. The words "login" and "sign up" are links.
You'd expect it to be right next to the "Sign Up" button on the tool bar below the logo. Since it's in a strange place, it's worth mentioning here.
Since users (including me) were having trouble finding the login button at the top of the page, I added an additional login button on the main menu.