Options may rematch after the trade in question, causing a resulting position that exceeds your option approval level Trade could result in a short position in a cash or IRA account You can check your margin and options privileges under the "Client services >General" tab on the TD Ameritrade website The working area of the thinkorswim platform can be divided into two parts: the left sidebar and the main window. The left sidebar is where you keep gadgets necessary for your work. The main window contains eight tabs, which provide you with numerous kinds of functionality: Monitor , Trade , Analyze , Scan , MarketWatch , Charts , Tools , and Help . Active Trader. The Active Trader tab is a thinkorswim interface designed especially for futures traders who can benefit from its handy bid/ask price ladder, one-click order entering, and high level of customization. This interface can be accessed by clicking Active Trader on the Trade tab.. To learn more about the Active Trader, watch the playlist below or refer to the articles: