Open Outlook
Go to Calendar
Select New Appointment or New Meeting
Enter the event details
Set the date and time
Click Reminder
Choose when you want the reminder to appear
Save and close the event
For an existing event, open it
Change the Reminder setting
Save the changes
For email reminders, open the email
Click Follow Up
Choose Add Reminder
Set the reminder time
Confirm the reminder
Check the Outlook Reminders window when prompted