Ground terminal connection

Good morning, after turning on Supernait 2, the speaker emits an electric current sound. After contacting your official email, they suggested using these two accessories to connect to the grounding terminal behind the amplifier. I would like to know if the yellow plug needs to be turned on after being connected to the power supply muff?

Or just plug it directly into the mop?

Because they haven’t responded to me yet

Found this kind on the Internet, he said, “There is a 1m resistance.” Is it safe, please

Have a read of this thread.