Click a placed switch to toggle it.
Place: click a breadboard hole for the first leg; other legs go to the right. Wire: click two points (holes, supply jacks, battery snaps, board pins). Click a part or wire to select it; then change its settings and press Update, or Remove it (Delete key works too). Drag a part to move it; a wire is removed and added again. Drag probes onto points. Supply: press OUTPUT; drag, scroll or use the arrow keys on the knobs.