You can view reports by individual campaign or for all campaigns.
To view all campaigns in one view, click on Reports. You will see the Campaigns Report page default which shows All Campaigns (you can also view individual campaign using the dropdown menu).
Data is shown graphically at the top of the screen and allows you to adjust the Date Range as well as view data by Impressions, Clicks, CTR and Spend. Below the graph view, you will notice a linear data view, which allows you to filter your results by Day, Campaign and by Content. You can sort any of the data points by clicking on the column headlines,, ie. Day, Impressions, Clicks, CTR, Conversions, Spend or eCPA.