The difference between the previous login screen and this improved version is the Student/Admin toggle. As you can see below, the word Student appears in black font and is underlined in blue. This indicates that it is the active screen. The word Admin appears to the right of it in gray, which represents that it is inactive. The student login is the default.
To log in as an administrator, simply click on the inactive Admin, and it will switch over to the Admin login screen. Admin will turn black and gain a blue underline, while Student will lose the underline and become inactive. The two fields will change, requiring your email address and password. If you have forgotten your password, you may click the Forgot Password? link at the bottom right of the password field.