Stimlus

I retired June 30, 2020. I have not received any stimulus check. I have electronically filed my income tax via TurboTax for the past 20 years so the IRS should know how to reach me. When I called the IRS about the stimulus check(s) they said I needed to file an amended 2020 tax return to receive the stimulus. I don't see how to do this in TurboTax.  Will TurboTax do the amendment or do I need to use a manual form from the IRS?