You enter your stock loss as an investment sale with a sales proceeds of $0 and a cost basis equal to what you paid for it.
You enter investment sales in the Wages and Income section of TurboTax, then Investments Sales, then Stocks, cryptocurrency, Mutual Funds, Bonds, etc...
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"