Silly! You got to plug it into the cRIO!
But in all seriousness, if it has 24V on it, then it should be working (electrically). Do the LEDs on the NI 9472 module light up when you trigger a solenoid?
If so, then the problem is electrical.
If not, the problem is at least programming.
Those LEDs will light up regardless of what is plugged into the top of it.
It should be in slot 3, or the 3rd slot from the ethernet and power connections for the cRIO.
I hope this helps.