Let me explain: If you want to short a stock, you just short it. You don't buy it, you SELL it. You'll have to have enough in your account to cover margin. That will be $2.50 a share. You'll also have to pay daily fees.
When you want to close your position, you "buy to cover". ONLY THEN will you be allowed to use the money you made when you sold short in the first place.
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