Click on the Mac OS X Installer link to download the installer
Then double click to expand/launch it
it will automatically give you the Arduino app the teal icon:
No Drivers To Install!
Thanks to Mac OS X having the drivers built in, you won't need to install any other software!
Find your Serial Port Device
You can use Terminal to help find and verify your Arduino. First, launch the Terminal app - you can Command-F to Find the Terminal.app program:
Double click to launch it. At the text prompt, type in ls /dev/cu* (note the first letter is a lower-case L)
Make sure you see a line with the text /dev/cu.usbmodemxxxx or /dev/cu.usbserial-xxxxx where the xxx's can be anything. This indicates that the driver installed properly and that the Circuit Playground was found.
You can close the Terminal program now
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