it is quite easy to do so. There are two operation directions in the software? One is "buy"? The other is to "sell" when you are short? Determine the warehouse quantity and place an order first? What about the price? Then click "sell" there? That's it.
For example, PTA 1 109? The price is 10630? I'm bearish? I want to sell 20 lots? So I input 20 hands first? Is the selling price 10630? Then click "sell" again.