Field Mapping for Modules works the same fashion as Mapping Modules from Data Source (previous).
You may add fields to the mapping list by clicking on a field in the 'Available Fields' column and dragging it to the 'Configured Fields' column. Only objects in the 'Configured fields' column will be mapped.
The display order may be changed by clicking and dragging a field to reposition it in the 'Configured Fields' column.
To remove a field from your configuration, click and drag fields back to the 'Available Fields' column.
Once you are done selecting your fields, click the Next button at the bottom right of the page, else click the Back button to return to the previous screen.
You will need to repeat these steps for all the modules you selected for mapping.