As of right now, Initial Realty Offering orders cannot be canceled.
Market Trading orders can be canceled as long as the trade has not been executed.
If the Market Trading order is still unfulfilled, then follow these steps:
Open the Fintor app.
Tap on the 2nd icon. (Portfolio)
Scroll down, and tap on Order History.
Tap on Open Orders.
From here, you'll be able to cancel any open orders.