Choose Connection mode: Direct or Crossed using the top toggle.
Select Strength: Inhibit or Excite using the second toggle.
Click Place Lights, then click anywhere on the canvas to add and right click to remove light sources (stimuli).
Click Place Vehicles, then click on the canvas to add vehicles, or right-click on a vehicle to remove it. Click the button again to stop placing vehicles.
Click Start Simulation to begin. You can pause/resume the simulation with the same button.
While simulation is running, controls are disabled to prevent changes.