A New Order is the placing of a new trade.
There are quite a few ways to place trades using the New Order functionality.
1. Click on the "Tools" tab on your Toolbar and select "New Order". The "New Order" window will pop up in the middle of the screen.
2. Right click on the symbol you would like to trade in the Market Watch and select "New Order".
3. Lastly press "F9" on your keyboard, the "New Order" window will appear on your screen.