You can start off by searching for any commodity future or option in the Kotak Neo mobile app or website. For example, if you wish to trade in Gold options, then search GOLD 50000, and you will find various contracts with different expiries. In addition, you can make use of the Commodity filter in the search to narrow down the results.
You can choose the desired contract and start trading.
You can only trade in commodity contracts if your Commodity segment is enabled. Click here to know the steps for activating the Commodity segment if it's not activated for your account.