In the Campaigns section, click on the down arrow to the left of the campaign and choose Archive. The campaign and all the ads in the campaign will be archived. Once a campaign is archived, you will be able to see it and view its statistics from the time it ran, but it will not run and you will not be able to re-activate it.
To see archived campaigns, click the Filter dropdown and select Archived. Choose Yes to see archived campaigns.
To view reports click on the down arrow to the left of the campaign and select View Report.