Step One:
Install Homebrew.
Open the Terminal app (Applications -> Utilities -> Terminal)
Copy & paste this command into the Terminal app:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Step Two:
To install Tor copy & paste this command into the Terminal app:
brew install tor
Step Three:
You will find a sample Tor configuration file at /usr/local/etc/tor/torrc.sample. Remove the .sample extension to make it effective.
Step Four: Configure your application to use Tor SOCKS in its proxy settings directly (for instant messaging, Jabber, IRC, etc), you can point your application directly at Tor (localhost port 9050).