Controling USB Switch with Arduino/Teensy

Hello guys,

I'm learning electronics with Arduino/Teensy boards. Your help would means a lot for my little project.. What I would like to achieve is to control a simple button on a USB Switch. So I can control the USB switch with Arduino or Teensy. (by preference, by closing the circuit)

The Usb Switch i'm using :

Two pics of the board :

What I've found around this is too advanced for me. Could someone point me to a beginner tutorial to achieve this? Also if you could tell me what components I need to achieve this, would really appreciate it. Thanks for your help!

Voltage across the pushbutton?

I don't know. I have nothing to measure it yet.

Then a relay or optocoupler is the best choice.