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
Are you on the right screen to enter a 1099R?
To enter your retirement income, Go to Federal> Wages and Income>Retirement Plans and Social Security>IRA 401 k) Pension Plan Withdrawals to enter your 1099R.
In the 1099-R interview, where you entered the amount of the pension on line 1, you enter the amount of the federal tax withheld on line 4.
If you don't know where to enter your 1099-R, see the instructions above, but if you were able to start the entry for your 1099-R, then the withheld tax goes in line 4.