Given two buttons, there are four possibilities you need to handle. Here's a simple truth table that shows them:
Code:
Button2 Button3 Result?
F F ??
F T Go Clockwise
T F Go Counter-clockwise
T T ??
On the "??" cases, you need to choose whether to do what it was already doing, stop, or some other specific action depending on what makes sense in your mechanism.
Use select VIs (or nested case statements or a select statement in a case statement, depending on what makes the most sense to you) to get the right result for each situation, then feed it to a Motor Set.