Method 1:

At the far right of the navigation menu (top of screen) is the Account drop-down menu. Under this menu are two options:

(a) If you are logged in, you will see

(b) If you are not logged in then you will see

Method 2:

When logged in, your account name and Log Out can be seen on several other screens, such as Minutes, Help, and Contact Us. This is what it looks like:

When you are not logged in, these will show Log In boxes.

Method 3:
Click the Account menu on the right end of the navigation bar to open your Account. At the end of the line starting with Home, click the Logout there.