Launch Raven-qt wallet and open Settings/Options
Click Open Configuration File
On a mac they file will only open if .conf files are already set top be opened with textEdit or another editor. If the raven.conf file get created, right click it and select always open with checkbox, then select TextEdit, and open it. If the raven.conf did not get created, just make a text file named raven.conf.
When the Raven.conf is created it can be found next to your wallet.dat
Mac: ~/Library/Application\ Support/Raven
A new empty file will open if you have a fresh install, paste:
rpcuser=SOME_USER_NAME rpcpassword=SOME_PASS_WORD rpcallowip=127.0.0.1 rpcport=8766 gen=0 server=1
Save and close