Why does not my second mouse slot work?

I have a dethadder elite from Razer playing mostly Minecraft but the back slot does not work when I'm sprinting I've tried the whole thing with a friend on a laptop (with that mouse) and it all worked, maybe it's a shot?

Which "rear slot"?

is the said "rear slot" on the motherboard?

Then he is viell. Broken, or not connected.

And with "Mouseslot" do you mean USB?

What is a "mouse slot", please?

I'm sorry, with second Mouseslot I mean the circled https://drive.google.com/...VlmIqh-RRG