If you are JIRA administrator you can:

Permission to create reminders

To grant permissions to create reminders for user groups:

  1. Go to Administration > Add-ons > Reminders;
  2. Choose groups in the field Groups who can create reminders for groups;

Queues and reminder archive

The reminders that will be sent are in the Reminder Queues. To remove a reminder from the queue:

Sent reminders are in the Reminder Archive