You need to edit that entry in the Investment Income section of TurboTax, then Stocks, Cryptocurrency, Bonds, Mutual Funds, Other. Find the investment sale you need to edit in the Your Investment Sales summary and click on the Review tab:
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On the stock sale screen, indicate that the cost basis is missing or incorrect and you will have an opportunity to enter the correct cost basis. A simple way to determine the cost basis of your RSU shares sold is to divide the income for the RSU's as reported on your W-2 form, plus any additional money you may have spent to acquire them, by the number of shares acquired. That will give you the cost of the shares that you can then multiply by the number of shares sold to arrive at their cost basis.
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