I had a stock in my account that was worthless. I want to take the loss and the brokerage firm removed it from my account.

If you know how much you paid for the stock that became worthless, you may report it on your return.  Here's how to enter it in TurboTax,

• In your Federal return, choose Wages & Income
• Scroll down to Investment Income (you might have to select See more income to view this topic) and Show more
• Start or Revisit Stocks, Mutual Funds, Bonds, Other
• Add a sale and answer No, you did not get a brokerage statement.  You will see the screen Choose the type of investment you sold.  Select the option for Stocks. 
• Continue through the interview, entering your data, until you reach the screen Do Any Special Situations Apply to This Sale?
• Choose the radio button for "Worthless securities" and Continue to complete the interview.