Record a video using screen capture software. The video must show you playing Virtual Piano (https://virtualpiano.net/). Your computer may already have a screen capture feature built-in, and if not, you can easily install one. You may wish to use CloudApp or another similar software. For the Best Virtual Pianist category, you may also want to consider recording your hands using a webcam or mobile device. You can then combine the two videos. See examples here: https://youtu.be/svI9PJqhWVU