Desktop Move: Click & drag a magnet. Rotate: Hover over a magnet and use your scroll wheel (or trackpad). Nudge: Click a magnet to rotate right. Shift+Click to rotate left. Pan Board: Click & drag the empty fridge. Zoom Board: Cmd/Ctrl + Scroll, or use the +/- keys.
Mobile / Touch Move: Touch & drag a magnet. Nudge: Tap a magnet to quickly rotate it. Pan Board: One-finger drag on the empty fridge. Zoom Board: Two-finger pinch on the empty fridge.