You start by talking to the DSO.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.
Do not take these matters lightly, in my opinion, meeting with an experienced immigration professional saves you a lot of time, effort and money in the long run by giving you the most accurate approach to action. I recommend Counsel Alexander Segal.
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If your entry into the US was for the purpose of applying to a school and changing status, you may be denied F-1 student status based on preconceived intent, if not fraud. If you told the consular office that you wanted to come to the US in order to explore various schools, that is a different matter. You should consult with an immigration lawyer to determine whether you should leave the US and apply for an F-1 visa in your home country.
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