1) To set up reminders follow these steps: 

• Open the app > Settings > Reminders.

2) Set amount, time and topic of reminders:

• In the Reminders settings choose amount, time and topic of reminders

3) If you stopped getting reminders:

• iOS has a limit of 60 reminders that any app can program at a time. Once these run out, you have to open the app to schedule more (it would be automatically, you just need to open the app).