ADvendio offers two versions of this tool.

•  4.3.5 Net Calculator within the Media Configuration (7.2.2.1.3 Setup the Net Calculator & Budget) or
• the "stand-alone" 4.5 Net Calculator.

You can configure and change the fields for the Stand-alone tool using the field set you find under the object Media Campaign:

Click on Edit to open the field set:

Drag and drop fields into the fields set.