You can add a new task in many different ways:
in the left menu, click on New email / New event
or in the day view, click on the hour where the event should start
or in the week or month view, click on the day where the event takes place
You will be brought to a page where you can input the event details (Title, notes, location, start and end times , and so on).
Events can be either full day (like a birthday), or have a start and end time.
To set the start and end time, select date and time in the begin and end fields. You can pick a date by clicking on the icon and selecting the date from the pop-up window that will appear.
Finally, if you are viewing multiple calendars (ex.: My Calendar + Group calendar), you can select which calendar this event belongs to. Note: you cannot save events to a calendar that is read-only.
To delete an event, simply open the event and click the Delete button. You cannot delete events that belong to a read-only calendar.