Thanks for trying the plugin!
If you would like to remove only one reminder related to a particular order of a customer, then you should do the following:
1. Install and activate WP Crontrol plugin.
2. Go to Tools -> Cron Events.
3. Find and delete an event with a hook name “ivole_send_reminder” and arguments matching the WooCommerce order number for which you would like to remove the reminder.
If you would like to remove a customer from ALL review reminders, then you can use this form: https://www.cusrev.com/unsubscribe.html. After submission of the form, reminders will never be sent to the provided email address.
I hope it answers your question!
