Yes, it came with the starter kit, and did not think that it would be a problem as it is part of the kit that I bought. When I changed the battery and used the USB cable it suddenly started to work and now I'm able to pick up the signal when pressing the button (thank you very much for the tips). So at this point with a simple code, I was able to make the unit work as it should. Now when I press the button the light for the button turns on and the Arduino knows that the function is on and the light confirms it. So this part is working, see picture:
So now to the second part which Ill try to figure out today... make the Arduino unit open and close the circuit of the valve when pressing the button.