From your home screen, tap Gold in the bottom navigation bar.
If you haven't activated the feature yet, you'll be guided through a quick setup and asked to accept the Terms & Conditions first.
Do I need to fund a separate Trading Account?
No. There's no separate Trading Account. Commodities are funded directly from your main account balance, the same way buying and selling crypto works.
When you buy: the amount is debited straight from your main balance
When you sell: the proceeds are credited straight back to your main balance
No top-up or withdrawal step: funding happens automatically at the moment of each order
Just make sure you have enough money in your main balance before you place an order.