take it easy guys
1. Install brew (http://brew.sh/)
2. brew update
3. brew install acrogenesis/macchanger/macchanger
Usage: macchanger [options] device
-m, --mac MAC Set the MAC address, macchanger -m XX:XX:XX:XX:XX:XX en0
-r, --random Set random MAC address, macchanger -r en0
-s, --show Show the MAC address, macchanger -s en0