While your default settings dictate daily, weekly and monthly automated email campaigns, you can also customize individual campaigns for a particular day in the Customize tab.
Customize an automated email campaign:
Click on the calendar icon to see the monthly view
Click on any day to customize the daily campaign that is set to go out on that day (but make sure that you have alerts set to go out on the day you select)
Click on any of the days that are marked with a "W" to customize the weekly campaign that is set to go out on that day, or a "M" to customize the monthly campaign that is set to go out on that day
Once you find the campaign you want to customize, you will see a familiar screen to edit the Time, Subject, Title and Intro for that particular campaign.
If you don't customize emails for a particular day, the email notifications will be sent out based on your default settings from the Settings tabs.
Note: If you click on a day that does not have a campaign schedule (i.e., a day that is not selected for daily, weekly or monthly alerts on the Settings tab) you will see an error message (seen below) that will alert you accordingly: