Log into your account and click on Campaigns & Bid By Domain in the left menu.
Find the campaign you wish to Pause and click the green Active button in the Status column to the right of the Campaign Name column.
Select Paused from the dropdown to pause the campaign.
Please note that if you pause a campaign, all content in the campaign will automatically be paused.
To Un-Pause or set a campaign back live, click on the Paused status dropdown and select Active.
Once you select Active or Paused in the dropdown, the campaigns will automatically update to that status.