Hi ,
My board not show on port
and i don't know ,I tested all way 
I use uno board and mac os 10.10.5
No port showing up -> drivers not installed, or not installed correctly.
Is it a clone? If so, the drivers you need will likely be different. Look at the part number on the chip nearest the USB port. It'll be ATmega 16u2 (use the official drivers), CH340G (you need the CH340G serial drivers - I don't know where to get them for mac), FT232 (you need the FTDI drivers). There's also some part number starting in CP - which needs it's own different set of serial drivers, I forget the number - just search the part number.
tnx, i have bad luck 
,mac is not good for ch34x