Minecraft wiki entry for Enchanting, associated text: To combine items, the player places the target item in the anvil's first slot and the sacrifice item in the second slot. If the combination is allowed, the resulting enchanted item appears in the anvil's output slot and an experience level cost, labeled "Enchantment Cost", appears below (green if the player has enough experience levels, red if they don't). To complete the enchanting, the player removes the enchanted item from the anvil's output slot, and their experience level is reduced accordingly.