An appointment is an item that appears on your calendar only. It does not involve other people’s calendars. If more than one person is invited it is referred to as a "meeting," but the initial steps for creating the appointment are the same.
Here are a few different ways you can add appointments:
If you’re in a day or week view of the calendar, click and drag the time period for which you want to create the appointment. Don’t worry if you’re not exact--you’ll have an opportunity to correct the time.
If you’re in the month view of the calendar, first click on the day of the appointment, and then drag out the time period as described above.
Right-click (ctrl-click on a Mac) on the time you want the appointment.
Select “New Appointment” from the “New” menu in the top left corner of the calendar pane.
Once you’ve chosen one of the above methods, enter the appropriate times for starting and ending the appointment, if necessary. Other options include:
Setting it as an all-day event, which will be displayed in the banner at the top of the day.
Setting a reminder at a designated interval before the meeting.
Setting the meeting to block your time, or not.
Set the meeting as tentative.
Make it a repeating meeting.
Set it as private, so that it is visible only as busy time (no details) to viewers of your calendar.
Add notes or attach documents to the appointment (if you’re in the QuickAdd appointment box, click “More Details…” to see these).