Delete the W-2 you entered for pension income.
Enter w-2 in the Search box located in the upper right of the program screen. Click on Jump to w-2
To enter, edit or delete a form 1099-R -
Or enter 1099-r in the Search box located in the upper right of the program screen. Click on Jump to 1099-R
If your return was accepted by the IRS as filed, then you should amend it to make the correction. As you follow the process for amending your return (instructions below), you will go back to the wages/W-2 section and delete the entry you made on your original return. Then, go to the Form 1099-R section and enter the details from your Form 1099-R. Don't forget that you may need to amend your state return too.
Use these steps to go to the Form 1099-R section:
See the following TurboTax article to get started with the amended return: How to amend (change or correct) a return you already filed