When you click one of the main menu items, you will usually see a table listing all related items (i.e. campaign or flows) and statistics. Use selections in the upper top corner to change the Filtering mode (choose, what items you want to see - Active, With traffic, Archived or All) and choose the dates you want to see the statistics for.
To go deeper, click a row and a context menu will appear. Use the buttons in this menu to see detailed reports or to edit the item.
You will find several total reports in the Reports section of the main menu.
Read further: "9.1 Accounts Report"