Use the charts to directly to make an order entry, as explained below.
Place a Limit Order: Hold the "SHIFT" key while scrolling over the chart, then click when your cursor is over the Limit Price that you want and an "Order Entry" screen will pop up.
Place a Stop Order: Hold the "CTRL" key while scrolling over the chart, then click when your cursor is over the Stop Price you want and an "Order Entry" screen will pop up.
Sell at the Market: Hold the "ALT" key while the cursor is over the chart, then click and an "Order Entry" screen will pop up.