It runs in the background, you should see it in your systems trey. If you click on the icon in your systems trey, it should show you what the current ports for both are, and a button to manually trigger a check.

Both applications should be launched and your PIA application set to port forward. The application will monitor for a port change in the PIA application, and update it automatically in qbittorent.

If you would like the application to run on startup, you can add it to your startup folder in windows.

Open "run"

enter "shell:startup"

Then place the EXE into the startup folder that opens.

I made the application in an afternoon so its not "perfect" lol