Log into your account and select the Campaigns & Bid By Domain section in the left rail.
Find the campaign you want to Archive and click on the gray arrow to the left of the Campaign Name. Then select Archive.
Once an Ad is archived, you will be able to see it and view its statistics from the time it ran, but it will no longer run and you will not be able to re-activate it.
To see the Archived Ads, click the Archived dropdown and select Yes to see archived ads or campaigns.
To view Reports click on the gray arrow to the left of the Ad Headline and select View Report.