How to file an MDR?

I was asked to file a Mandatory Declassification Review (MDR) on four RG numbers concerning a specific incident. I was also asked to inform NARA that we intend on examining the declassified records onsite and to file a separate MDR for each Record Group (RG). Where can I obtain a blank MDR form? If I have to , I'll fill them out by hand, and mail. If not yet, it would be very convenient if MDR forms could be sent electronically.