When your contest balance falls below $1,000, the Buy Credit button appears at the top of your Trading Room. To recharge your balance, click the button to open the menu and select your desired amount, such as $10,000 for $3 or $5,000 for $2. After choosing the amount that suits you, click Apply to confirm. The payment will be deducted from your real balance, allowing you to continue trading in the contest without interruption.