After you've downloaded PII Crawler and installed PII Crawler click PII Crawler to start the PII Crawler web interface. This will start an HTTP server runing at http://localhost:3001. You can navigate here from your browser or click open from the PII Crawler tray icon.
From here:
This will start scanning all files contained within the starting directory. It may take awhile for the scan to finish but you can start reviewing any results immediately as they come in.
When creating a new PII scan you have some scan options you can set.
To view the results click View Files on the scan:
From here you can filter and search through the results. You can also export results in CSV format.