You can see all the reminders you have sent under the label Wizy.io located below the COMPOSE button of your Gmail.
When your reminder is due, you will receive an email.
NB: You need to have Conversation view turned ON in your Gmail settings menu to ensure you get the original email showing the content concerning your Wizy.io reminder.
Can't find the email? If your Gmail is set to Priority Inbox, check in Everything Else.