Use the Add and Remove buttons to move selected fields between the Available Fields and Selected Fields boxes. (Note: Clicking Remove does not delete a field, just removes it from the Selected Fields box back into the Available fields box.)
To select multiple fields that are not in contiguous order, hold down the CTRL key and click each field you want to include. Click Add or Remove to move all selected fields at once.
To select multiple fields that are in contiguous order, hold down the Shift key and click the first and last items you want to include. All items in between your first and last selections are selected.
Use the Move Up and Move Down buttons to change the order of the fields in the Selected fields box. Fields export to columns in the order they appear under the Selected Fields list.