To view emails you have sent or scheduled to be sent simply click on the Track tab and you'll be able to see all the emails you have sent and if the recipient has opened, clicked or replied to your email.
Individual email pages show the content of the email, and the interaction history of the recipient.
All emails scheduled to be sent in the future can be found in the "Scheduled" section. By hovering over an email you'll be able to edit, delete or immediately send and scheduled email.
Unsent emails can be viewed and edited, including changing their send time.