It's really amazing, if you don't understand, just do it this way, no wonder so many people are on the rooftop

$BNB Brothers, please guide me on how to open a hedge order? My hand shook and I placed a sell order, and now I want to place a buy order, but whenever I open a limit buy order, it automatically trades off my sell order. I don't know how to operate it so that I can have a sell order + a buy order. Seeking advice, seeking advice.