Closing an order on the MT4 application is very simple within 2 steps. The article below will explain how to close an order on MT4 on iPhone.
How to close an order on MT4 app Iphone version
Tap the order you want to close from the “Order" tab of your app.
After tapping “Close", tap on “Close with***" at a preferred rate.
Profit can be gained if derived from the difference in exchange rate when the first order is closed. In contrast, losses might incure.