I made a mistake and need to delete a 1099r

To enter, edit or delete a form 1099-R -

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)
Scroll down to Retirement Plans and Social Security
On IRA, 401(k), Pension Plan Withdrawals (1099-R), click the start or update button

Or enter 1099-r in the Search box located in the upper right of the program screen. Click on Jump to 1099-R

To delete the 1099-R, you can follow these steps in TurboTax Online:

1. Click Tax Tools on the left side panel
2. Click Tools
3. Click Delete a Form
4. Scroll down to 1099-R, Click Delete
5. Confirm Delete
6. Click Continue with Return

@Runcornell