> Go to Advertiser
> Go to Campaigns
> Click on an existing campaign
> Select date range, click site and expand to view zones
> Click the gear under the custom bid, edit the zone CPM and save
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> Go to Advertiser
> Go to Campaigns
> Click on an existing campaign
> Select date range, click site and expand to view zones
> Click the gear under the custom bid, edit the zone CPM and save