Closing Current Position

To create Trade Orders first you need to add Symbol you want to create trade order for. See Adding Symbols to Trade Grid.

Right-click on the corresponding Symbol row that has opened position to show context menu.
Select Trade from context menu.
Select Close Position from context menu.
Select Close Position from context menu.
Limit order will be created and placed under corresponding Symbol row. Limit price will be equivalent to Ask for Buy order and to Bid for Sell order.
To transmit order press T button. See Transmitting Order for details.

U.S. Securities and Exchange Commission notes on:

Learn how to:

Create Buy Order,