[Mark McLeod]

Here's how to add a constant using the attached image as a reference.

1. Drag an Open 4 Motor into the Begin.vi block diagram
2. Put the cursor on the vi icon you just dropped and you'll see the input and output nodes highlighted (left of the attached image)
3. Put the cursor on one of the input node until the cursor becomes a wirespool (on the left of the vi icon) and right-click to get a pop-up menu (seen on the right of the attached image)
4. Navigate to Create->Constant and left-click
5. You'll get a new constant attached to the node that is the proper type for that particular kind of node. In this case a PWM constant.
6. The PWM constant by default starts as Invalid, so put the cursor on the new constant until the cursor becomes a hand, then left-click and choose the PWM it should be.