...
To link a campaign to a zone, go to Inventory > Campaigns:
Campaign properties > Linked Zones
If necessary, use the drop down menu to select the appropriate advertiser, and then click on the appropriate campaign name. This will take you to the Campaign properties screen. Click on the Linked Zones tab.
On the left hand side, a list of all available websites & banners is listed in the Available Zones section. Either select the specific zone(s) you wish the currently selected campaign to be linked to, or, select the website(s) to automatically select all zones in that website. Once the required website(s) and or zone(s) are selected, use the Link button to link the campaign to the zone(s). Once linked, the zone(s) will appear on the right hand side, in the Linked Zones section.
...