MEX-file Arguments in Code Generation not showing up

Hello - I am trying to set up Simulink as it is in the example:

http://www.mathworks.com/help/hdlcoder/examples/using-ip-core-generation-workflow-from-simulink-led-blinking.html

The only issue is that when I try configure Matlab settings to run the generated software interface model, I cannot find the 'Mex-file Arguments' box to input the FPGA IP address. Its simply not there. I looked for it in Model Configuration Parameters > Code Generation > Interface, as well as in every other location in the settings and I could not find it. I need to input the IP address of the FPGA there so I can communicate with it.

How can I get this setting option to show up?

Only differences from my setup to the one in the example: I am using Matlab 2015b I am using Zynq Z706 instead of Z702

Thanks, -D