I am trying to upload a program to the Makeblock Orion through USB. However, it doesn't work because the USB port option in Tools > Port is not shown. Why is this happening?
Perhaps you have not installed the driver!
See here (https://makeblockshop.eu/blogs/known-issues/88952964-instal-the-right-drivers-usb)
The problem is, I have OSX sierra.
OK - Take it up with who ever makes Makeblock , this is NOT an Arduino issue.