+1-(866)-840-2460 A stop-loss order is a tool used to protect your investment by automatically selling a stock once it reaches a certain price+1-(866)-840-2460. To set a stop-loss order on Robinhood, open the app, go to the stock or option you want to protect, and select "Trade." Choose "Sell" and set the stop price at which you'd like to exit the position if the price falls.