By default, the campaign will give your supporters the option to cover the processing fee for the transaction. It will be displayed as a box with an “Edit” link. You can change the display the fee coverage option with a checkbox. You can also choose to absorb the cost of the processing fee by eliminating that option.
To change the Campaign Processing Fee Settings, go to the Campaign Settings tab in the Campaign Editor. Click on “Campaign Processing Fee Settings” section to expand. Here, you can choose how the option is displayed, and you can choose for your organization to cover all processing fees. (Please note that if the setting is set to have the organization cover the processing fees, these transactions will not qualify for the Rate Guarantee.)