Did you program the scanner using Sentinel before? You will need to use Sentinel to update the scanner firmware, update the master Uniden database, and profile editing. The master database updating is optional if you are using ProScan to import directly from the RadioReference database. I would use Sentinel at first to get a better grip on how the scanner is programmed. ProScan can program the scanner the same way that Sentinel does it. ProScan has more features and options if you want to go that route.
The ProScan manual doesn't attempt to address any of the scanner functions including Quick Keys. Check out this document.
Easier to Read SDS-100/200 Digital Scanner Manual Search for "Quick Key" and the section
Understanding Quick Keys. It may take several readings and several cups of coffee over several days.