By going to the Analytics tab you can find out if your ads are working. Use the settings on the screen to control the charts.
There are several different reports that you can view.
An Impressions event is recorded each time an ad is viewed. The Impressions report shows the number of times that your ad (or ads) have been displayed to a user.
Every time an ad is clicked the event is recorded. The Click report shows the number of times that your ad (or ads) have been clicked.