Thanks Sergio. I see "Edison" in my Devices section of Finder now. I was able to copy the files over to the Edison, but when I start typing "screen /dev/cu.<TAB>", all I see is screen /dev/cu.usbmodem1423. When I try to screen into that, I get this error:
Cannot open line '/dev/cu.usbmodem1423' for R/W: Resource busy
Sorry, could not find a PTY.
Any ideas? I am using Yosemite though.
I tried this command but still can't see cu.usbserial...
sudo nvram boot-args="kext-dev-mode=1"