In your manual it says:
"The only step left is to tell our client about your receiver. If using a USB connected receiver you will need to know your serial port name.
To find this open Terminal and enter: ls /dev/tty*
This will list your serial ports. A typical output is shown below:
I use a Mac OS X el Capitan with a R820T USB dongle.
But I have the following problem.
I can not find out which is my Serial Port Name:
m-gs-computer:~ martin$ ls /dev/tty*