Reminder Blasts are for Email Thermometers only.
3 days after you have sent a Blast, a “Remind” button will appear next to the Blast in the reporting area. You can click it, to send a reminder to survey recipients who haven’t yet responded.
Before sending, you have an option to customize the subject line and remove recipients from the List:
The Reminder button disappears 28 days after the original survey was sent.
You can only send one reminder. We don’t like to annoy recipients ;-).