In order to view Stats, you will need to be listed as the Owner of your Account/Team.
Click the Stats icon in the left hand panel to open the page and select the graph you would like to display.
Please note that you will only be able to view the individual user stats connected to users in your Account/Team.
The Stats page is only meant to provide a quick overview of the activity in your Account. For a more detailed breakdown, we recommend generating an actual Order Report.