1. To open the calendar, from the home screen tap Calendar.
   
2. To create a new event, tap the + icon, or touch and hold an Empty spot on the calendar.
   
3. Enter the desired information, and then tap Add.
   
4. To edit an event, from the Calendar, tap the Desired event, and then select Edit.
   
5. Edit the fields as desired, and then tap Done.
   
6. To delete an event, from the Calendar, tap the Desired event, and then tap Delete Event.
   
7. Tap Delete Event again to confirm.
   Note: Learn more from Apple support article: Calendar: Reply to an event or calendar invitation.