In MetaTrader 4, you can close your trades from the Order window. Additionally, you can select to close, modify the order, or add a trailing stop by right-clicking on the trade in the Terminal window or the chart. You can also use the "x" to close trades if One Click Trading is enabled. The MetaTrader platform allows you to close positions partially. To do so, you need to reduce the trading volume to the amount you want in the "Order" window.