Sorry, I don't speak fluent english and I've just made a video without sound...
I never tested on Mac but on PC, when you see the context menu, I click on the right button of the mouse...
On Mac, if your mouse has only one button, try to click and maintain the button 1 or 2 sec...
PS : It's more easy to exchange on github : https://github.com/MatMoul/g810-led/issues