You can edit a campaigns CPC and Budget in 3 places: Campaign Performance, Campaign Manager, and the Edit Campaign screen.

Campaign Performance:

In-line edit the CPC and Budget by clicking on the blue text and entering the new values. Click the check box to save the changes.

Campaign Manager:

In-line edit the CPC and Budget by clicking on the blue text and entering the new values. Click the checkbox to save the changes.

Edit Campaign:

Enter the CPC and Budget in their corresponding fields. Click Save at the bottom.

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