You will enter this into TurboTax as though you had received a 1099-B form. The 1099-B form that you would have received would have shown the name of the company, the date that you invested in the company, the amount that you gave them, the date that you sold your shares (which is the date the company went completely bankrupt and you were certain that you could not recover your investment), and the amount that you sold them for (that is zero).
This will show a capital loss that you can use against other capital income. Or you can use it against regular income at a rate of $3000 every year until it is used up.
Make certain to maintain all documentation related to your investment and the end of the company in order to prove this all to the IRS if they ask.
@sagi-tiferet
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