How do I make changes to a form for review?

Here's where your 1099-B goes in TurboTax:

1. Open (continue) your return if it isn't already open.
2. Income & Expenses
3. Scroll to Stocks, Mutual Funds, Bonds, Other
4. Answer Yes to Did you sell stocks, mutual funds, bonds, or other investments in 2020?
   • If you see Here's the info we have for these investment sales, select Add More Sales.
5. Answer Yes to Did you get a 1099-B or brokerage statement for these sales?
6. At Let's get your tax info, choose how you want to enter your 1099-B (type it in yourself).
7. Make adjustments as necessary.

 After entering or importing your 1099 B be sure to review the detail.  From time to time your broker does not know what your basis was (amount you paid for the investment), and it will be blank.  This will result in owing excess taxes.  You can be manually enter a correction.