To view statistics of a single campaign (active or ended):

1) Sign in to your account,
2) Find the 'Campaigns' tab and go to your campaign list:




3) At the end of the line with the campaign of your interest, find the 'Statistics' icon, click on it:




You are already in the statistics section for this video.

Or:

1) Once you've signed in to your Advertisers account, select the 'Statistics' section and you'll be taken to the page with  statistics of ALL your campaigns:




2) Once you've been redirected to the section, find the 'Campaigns' box.




3)  You can check campaign's exact statistics, once you've selected one from the list.