You need a margin account to be able to do what you are asking. From the simplicity of this question I gather that you are inexperienced. Suggest you do some research before trading. There is a ton of good material out there. Some I like regarding trading: "how I made 2,000,000, in the stock market" "reminisce of a stock operator" tradimo.com & freeonlinetradingeducation.com-especiall... like the videos by mark sutton. There is no way I could list all the resources available. Get busy, and please don't trade without getting some education.
So I asked a hypothetical question about buy a stock and then selling it. Someine told me that I cant buy anymore stocks until after 3 days, when the transaction clears.
Say I sell a stock thats doing very good. Would the reward I recieve be the price of the stock in the day I decided to sell it or would it be the price if the stocks after the 3 days?