How to Modify or Cancel Pending Orders on MT5 (Android)
Tap "Trade" in the bottom menu to display your open positions and pending orders (new limit and stop orders).
From here, you can modify or cancel pending orders.
How to Modify Pending Orders from the Trade Screen
Tap the order you want to modify in the "Trade" screen, then tap "Modify Order" from the displayed menu.
Enter the modification details (stop loss or take profit levels) on the order screen, and tap "Modify" to change the order.
How to Cancel Pending Orders from the Trade Screen
Tap the order you want to cancel in the "Trade" screen, then tap "Delete Order" from the displayed menu. A confirmation screen will appear; tap "Delete" to cancel the order.