This article will walk you through how to archive campaigns. Make sure you are in the correct Advertiser from your Advertiser dropdown menu (top right of dashboard).
Click on Campaigns in the Dashboard, the default shows the campaigns created in the last 7 days (highlighted in Green).
Click on All to see all of your campaigns for the selected Advertiser OR type in the Search field.
Select the box next to any campaigns you would like to Archive (make no longer editable):
A pop up window will appear:
If you need to find your Archived Campaigns again in the future, just select the dropdown menu from the "Show" button and select "Archived Campaigns":
Just Archived Campaigns will appear: