page as seen on the device:
New events can be added with the "+" plus button.
Tapping on "New Event" you can specify a title for the event.
Also you can select from the list of event categories.
You can specify a beginning and an ending date/time for the event.
When done with specifications the event will be listed in the calendar.
Outdated or cancelled events can be deleted.
In the "Day" view mode one can see the hours of the event.
Each event category can be distinguished by its color.