You must be logged in with a valid account. On the wallet page you can check your balance details. Your available balance must be greater than 0. Please deposit additional funds if this is not the case.
Proceed to the trade page for the futures contract you'd like to trade. The Place Order panel will allow you to place a buy or sell order. Input the number of contracts you would like to buy or sell as a multiple of lot size. There will be other fields and options depending on your order type. Once you have completed the order form, click the Buy or Sell button and your order will be sent to the matching engine.