I am sorry for any inconvenience not being able to access reporting from the "More" button may have caused. A recent change removed some options from the "More" button in order to clean up the experience and remove redundancies that could be accessed elsewhere on the site. In your case, you can access the reporting for any campaign by clicking the "Reporting" tab at the top of the page. This will list out your last 500 email campaigns that were sent. Then you can click on the reporting for an individual campaign and see the actual contacts that opened, unsubscribed, etc.