The concept how to set DFF up would be very similar for all the pages of the Buyer's Work Center.
The following note has detail how-to and screenshots of each steps:
How to Setup Descriptive Flexfields for Purchasing Orders forms on Buyer Work Center and Core Purchasing (Doc ID 972936.1)
Hope this helps,
Thanks, I have seen this document and understand how to personalize the dff fields to display them.
My issue is that there does not appear to be a flexfield column that I can choose on the shipments level on the BWC.
I hit personalize and here are all the Shipment fields listed: