Open the Reminders app
Tap New Reminder
Type your reminder
Tap the info icon
Turn on Remind me on a day
Set the date
Turn on Remind me at a time
Set the time
Tap Add
Use Siri by saying “Remind me to [task] at [time]”
Create reminders from Calendar, Messages, or Mail when available
Edit a reminder by opening it and changing the details
Delete a reminder by swiping left and tapping Delete