Click on Promote from the left dashboard. In addition to scheduled promo emails and social media, there is a second tab called Performance Metrics.
This tab will show all of the emails/posts that have been sent, plus the following analytics:
If you interact with any of the emails or posts in one of the ways above, the numbers in the table will update once per day
Note that if you test using a test email (from the preview features), the numbers don’t get tracked