Logitech G19 unable to use its functions

I have installed Manjaro Plasma Desktop 21.3, I like it as an operating system,congratulations.
Having a Logitech G19 Keyboard in very good condition I would like to use it, unfortunately apart from writing on it and the keys illuminated in green color allways, i can`t do anything else with the possibilities that such a Keyboard offers. I found Links that proposes solutions, the point is that would kindly need someone to take a look at the Links, after patiently step-by-step explain to me how to install.Here the Links:

Thank you in advance for any interest and help:)