You may find the need to edit existing advertising Costs, whether it be to rename or change the default values that automatically carry over when the Cost is used. Changes to the Cost Name will update ALL instances where this Cost is used. Changes to default values will only impact future use of this Cost.
To Edit A Cost
You must be an Administrator user to edit Costs
Click on your company name in the upper right corner of Bionic.
Click on the Administration option
Click on the Costs Columns tab
Click on the Cost Name of the Cost you want to edit
You may edit the Name, default Currency, Rate & Overage Buffer %
Press Save Cost button to update