How do I ensure that "cost basis reported to the IRS" is captured correctly in Tax filing?

The amount sent to the IRS is what's on the 1099-B.

You can correct a basis from the 

1. Sign into TurboTax
2. There is a Sidebar to the left
3. Under Federal
4. Select Wages & Income
5. In the main body, scroll down to Investments and Savings (1099-B, 1099-INT, 1099-DIV, 1099-K, Crypto) 
6. Depending on what you've already posted, you may see different screens
7. If you've already entered transactions, select the account to change
8. [Edit]
9. Choose the stock (Use the Pencil)
10. Under the Cost or other basis 
11. Choose The cost basis is incorrect or missing on my 1099-B.
12. Make the changes