How to import preprocess file at MATLAB into CONN to skip preprocess steps in CONN?

Hi guys, I know it is perhaps simple but I have no idea how to import files that i had preprocess at MATLAB into CONN. I am new to CONN. I watched youtube to learn it but they mostly used the raw data and preprocess in CONN. I tried to import the one had been preprocess but I realized the MNI canonical didn't fit my normalized brain structure. 

Thank you