What do you mean by a "deduction" from your retirement account. Do you mean that you took money out of a retirement account, such as an IRA or 410(k)? If that's what you did, you should have received a Form 1099-R showing the amount you took out. You enter the 1099-R in TurboTax under Wages & Income > Retirement Plans and Social Security. If you did not receive the 1099-R contact the plan administrator.
You did not ask a question. Do you have a question about how to enter your Form 1099-R?
Are you adding to a tax return that you are still working on, or do you need to add something to a tax return that you already filed?