The smelter can be found in the Others menu, as shown in the image. Simply click on it, and the smelter menu will open.
In this menu, you can see its functionality. You will need to drag and drop the item you want to smelt to break it down into useful items, rarity tokens, gold, and other crafting materials. You can also use a shortcut to send items directly to the smelter by combining Ctrl + Alt + right-click, as shown at the bottom of the menu.
The bottom part of the smelter menu indicates what you will receive for the items you place in the smelter. The items to be obtained will appear in the squares along with some information about the quantity of these items and the chance you have when smelting these items, meaning that not all products are guaranteed to be obtained if you are smelting an item.
You can only place rarity equipment in the smelter, with some exceptions, such as fish. Higher rarity equipment will yield better products when smelted, but be careful not to smelt something that might have value to someone else, as you could trade it for potentially more valuable things.The smelted product always goes directly to your purse, except for gold, which goes to the bank, meaning you won't have to worry if your backpack is full.