To report an investment sale using the online editions you will need to upgrade to the Premier edition. The investment sale is reported on a Schedule D and Form 8949. You should have received a Form 1099-B from your broker for the sale.
Enter investment sales in the Search box located in the upper right of the program screen. Click on Jump to investment sales
You will need to amend the 2018 tax return to add the investment sale. An amended federal tax return, Form 1040X, can only be printed and mailed, it cannot be e-filed. The IRS will take up to 4 months or longer to process the amended tax return. If taxes are owed after completing the amended return, you send a check with the amended return when it is mailed. If the amended return has a tax refund, then the IRS will send you a refund check in the mail for the refund, the refund cannot be direct deposited.
The tax return should not be amended until the tax refund has been received from the IRS.
See this TurboTax support FAQ for amending a tax return - <a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed"...>
