1. To open the calendar, from the home screen, select Calendar.
   
2. Review the prompt for What's New in Calendar then select Continue.
   
3. Review the Allow location access to Calendar prompt then select Don't Allow or Allow.
   
4. To view the Calendar by year, month, day, or week, select the desired tab at the top of the screen.
   
5. To create a new event, select the + icon, or select and hold an Empty spot on the calendar.
   
6. Enter the desired information, and then select Add.
   
7. To edit an event, from the Calendar, select the Desired event, and then select Edit.
   
8. Edit the fields as desired, and then select Done.
   
9. To delete an event, from the Calendar, select the Desired event, and then select Delete Event.
   
10. Select Delete Event again to confirm.
    Note: Learn more from Apple support article: Calendar: Reply to an event or calendar invitation