Answered By: Dave Wiseman Last Updated: Jun 16, 2015 Views: 52
Follow this path:
File=>Print=>Copies & Pages=>Finishing the two-sided option is in the Finishing menu.
This is the Mac File menu
Here is the Print menu where you will find the Copies & Pages options
Choose Finishing to see the duplex (two-sided) options
In the finishing options choose your duplex settings