Here is a quick snapshot to enable an FTP Server on Mac OSX. The below commands need to be run on a terminal.
Starting the FTP Server
sudo -s launchctl load -w /System/Library/LaunchDaemons/ftp.plist
That's it! The FTP Server is enabled
Stopping the FTP Server
Use the below to stop the FTP Server
sudo -s launchctl unload -w /System/Library/LaunchDaemons/ftp.plist
Accessing the FTP Server
Simply use a client like FileZilla to seamlessly transfer whatever you need!
Use the IP Address of the Mac as the server and the username and password needed.