Ah, you're moving along quite well. This is where Camsoft really excels. You want to investigate the inputio.fil and its function.
You can put in something like this for beginners:
IF#16=1 THEN FEEDHOLD 'input16 feedhold button
IF#17=1 THEN CYCLESTART 'input 17 cyclestart button
IF#18=1 THEN ESTOP 'input 18 estop button
You can get FAR more sophisicated.
You'll want more buttons to get the most out of Camsoft. I'd suggest getting an adlink IO board model 7296 when you're ready to do serious IO