How to set CP2102?

I just downloaded Atom and PlatformIO IDE to Mac, but unfortunately I seem to be to n00b because I can’t find where to define my CP2102 device

Could any kind person here help me define where to set port, think it’s ‘/dev/cu.SLAB_USBtoUAR’ in Arduino IDE

http://docs.platformio.org/en/latest/projectconf/section_env_upload.html#upload-port