Oh dear! You need to go to the Newbies board (yes it is called that). A stop loss order is when you put an order in after you bought a stock to sell it at a certain price below what you bought it for to stop your loss. MMs can see those and will go down and grab them. A market order is when you don't specify what you will sell or buy the stock for. MMs will always give you the worst possible price. No offense, but anyone who doesn't know these basics should not buy and sell stock!