The starting material and reagent are pre-drawn on the left; the product is on the right. Draw the curved arrow(s) on the substrates that turn the starting material into the product. Draw each arrow completely, arrowhead included — one stroke or several. Start the arrow ON the electron source (an atom’s lone pair/charge, or a bond) and point its head exactly AT its destination (an atom, or squarely on a bond). Rings show what the honeycomb vision recognized: green = attacking position, red = attacked position.