Page three of this tutorial --
https://decibel.ni.com/content/docs/DOC-26314 -- may help out.
The short answer is that if you open a resource in your code and register it by name, it will show up. If you select an actuator value in the table, a control will display allowing you to modify the value. Motors are somewhat dangerous, so they utilize a momentary enable button. This means, you select, then set the desired speed, then click and hold the enable button for as long as you want the motor controller to be sent that value. Other actuators don't require the enable button.
If this doesn't work, please describe what it does do to the LEDs, etc. And don't forget to enable the robot on the driver station.
Greg McKaskle