After you set the inputs and outputs for the CIN, connect wires to all the terminal pairs on the CIN to specify the data you want to pass to the CIN and the data you want to receive from the CIN. The order of terminal pairs on the CIN corresponds to the order in which parameters are passed to the code. You can use any LabVIEW data types as CIN parameters, so you can pass arbitrarily complex hierarchical data structures, such as arrays containing clusters that can in turn contain other arrays or clusters to a CIN.
After you wire the inputs and outputs to the CIN, create a .c file.