Click FileNewAppointment, or double-click in a blank space in the calendar to open the Appointment dialog. The particular time on the calendar view against which you have double clicked on will be suggested for the new appointment. You can also directly write in the calendar and then adjust the duration by dragging it with the mouse.

If you use the Appointment dialog:

Select a calendar in the Calendar drop-down list.

Enter a brief summary in the Summary field.

(Optional) Type a location in the Location field.

To select this appointment as an all day event, click OptionsAll Day Event, or click the All Day Event button on the toolbar.

Select the date and time.

If the event is not an all day event, select either For to specify the duration, or select Until to specify the ending time of the event.

(Optional) Enter a description in the Description field.

To show the time as busy to others, click OptionsShow Time as Busy.