Uncovered shares when a private company was sold

[KateK123]

I worked for a few years for a private company and exercised their RSU when I left the company (purchased RSUs of a private company, payed with my own money). They sent me form 3921 a year after.

Last year the company was acquired, and the parent company sent me two forms 1099-B, where they only reported proceeds (field 1d) and nothing for cost basis, 1e is empty. Field 5 is checked as "noncovered security". 

As the form is sent by a parent company, not a brocker, I cannot preload it in Turbotax, I can only enter it manually. 

Could you clarify what is the corect way of reporting cost basis for these securities? Can I just manyally enter 1099-B and put cost basis in 1e based on the information in my 3921 (number of RSUs multiplied by the price I payed)? 
Or should I enter 1099-B without cost basis and add it somewhere else? If yes, where? 
Thank you 

[ThomasM125]

You should enter the cost basis as reported on the Form 1099-B. 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, that is where you can enter what you paid for the stock: