How to update a DFF field from a BI publisher report

We need to modify Generate Extensible Work Order Traveler Report and accommodate a print counter, last print date, last printed by at the top of the report. The purpose is to have a document control on who and how many times the report was printed. The counter, print date, printed by need to be capture in a DFF. We need the information on how to update the DFF from BI publisher report.