Yep I can explain the whole bit. You need to apply for a marginal account. Right now you are using a cash account which means you have to go through whats called settling of the funds which is 3 business days. Like sheep said it's a rule made by Finra/Sec so any brokerage site will have the same rules applied. Margin like sheep said allows for three day trades per 5 rolling business days and you can get your funds to trade back immediatly. What does it take to apply for margin? For just margin you don't need anything but to put money in your account and apply for margin on TD's site. If you want marginal loan then you neeed at least 2k in your account for a 1 to 2 marginal loan. Good luck