Scheduled Send is an option that can be selected when sending a message, allowing you to select a specific date and time that the message should be sent. Because this will generally result in the message being held for a longer period of time before the message is sent, they are placed in a new default folder labelled Scheduled.
Step 1: Click Scheduled Send from the Send drop down
Step 2: Set the Send Date and Send Time, click Send
Step 3: The email is placed in the Scheduled folder giving you options to Send immediately, Edit, or Delete