Preliminary - Opening the FCU
You must have read the Folder FCU section to get instruction on how to access this FCU.
The CALENDAR_DC FCU consists of two elements, the CALENDAR_DC folder and an Events document.

Both are editable and configurable.
CALENDAR_DC

Besides indicating the name of the FCU and its last update date and time, the CALENDAR_DC also keeps the list of the Event Categories which you will youse later on to create events in the Events document.
Adding Categories
If you want to create a new category, simply click on the Add button.
A <NEW> entry is added to the list:

You can give it a name and designate a color, which will be distinctive to all events associated to this new category - like, for instance, when displayed in the Calendar.
See the example below:

You can additionally modify the value of the Alpha parameter - controlling the transparency of the color.
The Alpha value ranges from 255 (100% opaque) to 0 (totally transparent).
Do not forget to click on the Apply or the Save button to respectively save the newly created item, or save it and close the component. And notice how the Last Update information has changed:

Editing / Deleting Categories
Editing an Event Category is a simple process - just click on its name to access the configuration palette as highlighted below:

In the Edit mode, a Delete button is located next to the Add button, allowing you to delete the currently selected category.