How to interface FFT core with I/O

I am working an application that involves reading in an analog signal and performing a 4k FFT on the signal.

I have read the FFT megacore pdf and can generate standalone FFT files with the parameters I want. I have been able to use the on-board ADC to display the data values on the console using qsys.

However I do not under how to use the core so that it will transform the output of the ADC.