[propionate]

I'm not on a computer that has labVIEW at the moment, but hopefully I can help you out. If you properly installed LabVIEW, there should be a number of example VIs that you can access. One of these VIs is a motor control example, which will allow you to change the speed of a motor using a slider on the front panel. I suggest integrating this example into your code first, and then moving into using a button.

Speaking of which, you may have some problems controlling speed with just a single button. Do you want it to simply be on or off? Do you want variable speed?