This video is a longer one, it explains how to figure out which note to play.
The idea is very simple but the application takes practice. Before you move on to the rest of the course you should be able to ready Ode To Joy, get the notes in the download below, and be able to play it by just looking at the dots.
The TAB is included to help you out but you need to be honest with yourself. Don't move on until you can play the piece by looking at the dots and not the TAB.