If the current price is 1560, you can sign 1570 and make a deal at the price of 1560 immediately.

For 1550 that has already been closed, you can put a bill of 1560, but you can't close the deal until it rises to 1560.

These are the functions of trading software. See if the trading software you use has a stop loss function, because there are several trading software on the market now.