How to initiate a document scan??

I have had this machine for over a year; took forever to set it up because the instruction manuals are horrendous. This machine is the most non-intuitive machine I have ever owned. Tried to scan to my PC from the machine. Did it once by dumb luck, cannot for the life of me (3 days later) repeat it. I have just spend an hour combing through the online manual, which has dozens of pages on how to configure it, but NOTHING I can find about how to operate the scan function!!! All I want to do is scan a multi-page document to my printer and save it as a .pdf. When I open Document Manager and click File > Acquire Image, the only choice is my little old desktop scanner, Visioneer. No Panasonic DP-190...and this is in the Panasonic Document Manager.

Help!!

Many thanks,

Paula