To schedule an email go under the “Configuration” - “Email scheduling” tab 

Click on

Then define what email you to schedule and when:

You can choose the email you wish to send but also choose the status of the concerned guests.

The scheduling of this email can be done depending on a number of days before or after the event 

For example: send out two days after the event a “thank you” email. 

If these periods do not correspond to what you want to do, you can choose the exact date and time you want to send out that email. 

Once your emails are schedule it will appear as below:

You will be able to delete or modify all those schedule emails.