Once you login to your Autopilot account, you'll need to open up the "Message Centre".
Next, click on "Outbox".
From here you'll see all of the emails that have been sent out from your account. To pull a report for a single send out, simply check the box to the left of the email campaign and click the button in the top left which says "Report". This will show you all of the metrics for this email campaign. Feel free to check as many boxes as you want data for as all of the reports will be presented on the following page after you click the Report button.
If you are having problems using this reporting feature, please submit a support request and we can certainly help out further.