The main screen for Syncomat is a series of buttons which are enabled based on what you can possibly do next.
In this screen, the only buttons are New Lecture and Open Lecture. The menu options File | New Lecture and File | Open Lecture do the same thing as these buttons. In general, there is a menu option which corresponds to each button. The menu options are enabled and disabled as you perform various tasks.
So, to continue with this tutorial, press New Lecture.