MAC cannot detect my Intel Galileo

I have just gotten a Galileo board.

I followed the tutorial on how to get started here at https://learn.sparkfun.com/tutorials/galileo-getting-started-guide/driver-installation

and then I realized that my MAC is not able to detect "Gadget Serial v2.4".

The same goes for my Arduino IDE. I can see my board name "Galileo", but I can't see the port that is connected to the Galileo.

Please assist.