Upon startup, a warning dialog will be presented in the event that the daemon is not currently running. If you do not desire the functionality of the notification, you can Continue without daemon to start the daemon at that time. Otherwise select the Start daemon now option to allow for proper notification. You can create additional holidays if you choose the 'define holidays' option under the 'config' menu. This will write to a .holiday file in your home directory.
Various views are available under the 'View' menu.
The week view supplies an option to add users to your scheduling information. Any user who allows their appointments to be public can be added to your view by selecting the 'Name' button and entering their user-id. The path should be automagically filled in for you. These appointments will show up on your weekly view, but at this time they are not visible on the main window, and they will not cause notifications to be generated. To change the hours which are displayed in your weekly view, simply choose the appropriate option from the 'Config' menu.