A Stop order becomes a market order to buy or sell securities or commodities once the specified stop price is attained or penetrated. A Stop order is not guaranteed a specific execution price.
To create a Stop order
Click the Ask price to create a BUY order, or the Bid price to create a SELL order.
In the Type field select STP as the order type.
Enter the Stop Election price in the Aux. Price field.
To transmit the order, click the "T" in the Status field.
For a more detailed description of stop orders, visit the Order Typesinformation page.