This tutorial requires that you have classes already entered, which is done either by connecting your Google Classroom account, or by entering personal classes.
Instructions can be found here
To set each class's schedule:
Select "Configure" from the side bar
Select Schedules and Edit your schedule by clicking the pencil
Click on Class Schedules
Select one class and click "Add a schedule"
Enter the correct info and Save
Repeat these steps for all of your classes
Publish your schedule