4.3 Install Driver (for USB connections only)
If you opt for a USB connection between your phone and PC, you will have to download the proper driver (Android Debug Bridge) to your PC. The DroidCam documentation lays out this process. Pay special attention to Step 3 in the documentation as it tells you how to enable debugging on your phone.
Here I will download the appropriate driver for my phone (a Samsung).
Next, I will install Android Debug Bridge for my phone to my PC.