Analog/Digital MUX Breakout

I bought this from sparkfun The example code is for controlling 16 inputs.How can I control 16 outputs with it?

Unless I am mistreadig the Sparkfun web site, the output and inputs are the same thing (ie, the MUX is just a pipe that works in either direction). What you need to change is the pin direction on the Arduino from INPUT to OUPUT for the pin that is receiving the signal.