To add an event into your schedule, first go to the schedule module and select the schedule you want to add an event to. It is important to note that you are unable to add events into the schedule if you have "My Schedule" selected. You must select "All" or any of the specific schedules that you have created.
Go to the date that you want to add an event to and two icons will appear. Use the '+' icon to add a new event. The other icon gives you an overview of the instructors and gives you the option to delete all the events of that day.
You can also add a new event by clicking on the drop down Options, which is below the schedule. Then select ''New event''.
You can find more detailed information on setting up an event using this article.