Drag from a square output to any node to connect, or tap the output then tap a node. Drag a wire off a round input to move it or break it. Double-click the canvas to add a node. Tap a wire to label or cut it. Shift-drag or use Highlight to box-select, Ctrl/Cmd+A selects all, Delete removes the selection. Drag empty space to pan, scroll or pinch to zoom.