How do I report the sale of stock in a privately-held company when I don't receive a 1099-B?

To enter an investment sale -

Click on Federal Taxes (Personal using Home and Business)
Click on Wages and Income (Personal Income using Home and Business)
Click on I'll choose what I work on (if shown)
Under Investment Income
On Stocks, Cryptocurrency, Mutual Funds, Bonds, Other, click the start or update button

On the screen Let's import your tax info, click on Enter a different way

On the screen OK, let's start with one investment type select Stocks, Bonds, Mutual Funds and Continue

On the screen Which bank or brokerage is on your 1099‑B? enter any name and Continue

On the next screen answer the questions presented and Continue

On the screen Now, choose how to enter your sales select One by One and Continue

On the screen Look for your sales on your 1099‑B click on Continue

On the screen Now, enter one sale on your 1099‑B enter the information for your investment sale

In TurboTax Online Premium, enter an investment sale without a 1099-B form by following these steps:       

• Click on Federal down the left side of the screen.
• Click on Wages & Income down the left side of the screen.
• Scroll down to Investments and Savings and click the down arrow to the right.
• Click Start / Revisit to the right of Stocks, Cryptocurrency, Mutual Funds, Bonds, Other.
• You may have to click Add investments.
• At the screen Let's import your tax info, click Enter a different way.
• Click on Stock, Bonds, Mutual funds. Click  Continue.
• At the screen Which bank or brokerage is on your 1099-B, enter the information. Click Continue.
• Do these sales include any employee stock, click No.
• Do you have more than three sales on your 1099-B, click No.
• Do these sales include any other types of investments, click No.
• Did you buy every investment listed on your 1099-B, click Yes.  Click Continue.
• At the screen Now, choose how to enter your sales, select One by one.  Click Continue.
• At the screen Look for your sales on your 1099-B, click Continue.
• At the screen Now enter one sale, enter information. 
• Under Sales section title, select Short term did not receive 1099-B form (code C) or Long term did not receive 1099-B form (code F).
• Click Continue.
• Repeat as necessary by clicking  Add another sales total.  Click Continue.

@trickskier52