Yes, open orders can be modified.
Step 1: Go to the Orders section at the bottom and swipe left on the pending order.
Step 2: Tap on the modify icon to modify the order.
Step 3: You can drag the limit, stoploss and target line to set them at desired price.
Step 4: Click on the keyboard icon to enter a specific price.
Step 5: Adjust the quantity or lot size by using the + and - icons.
Step 6: Swipe to modify and confirm the changes.