Add nodes: Use the toolbox on the left (Cause, Gate, Effect). Drag to reposition. Click an output port, then an input port to connect.
Modes: Use the top toggle. In Deterministic, click a Cause’s LED to toggle ON/OFF. In Probabilistic, adjust Cause sliders (and see effects propagate).
Gates: Select a Gate and set Threshold N; gate fires when at least N inputs are active.
Selection & editing: Click to select. Cmd/Ctrl-click for multi-select. Shift-drag for box select. Delete removes selection.
Save/Load: Use Project menu. Export SVG for a clean graphic without the dark background.
Keyboard: ⌘/Ctrl +/− to zoom, Esc clears selection.