Once your return has been processed you will complete a Form 1040X --- which is not yet available --- and submit it to amend the mistakes made when you filed your original return. It takes the IRS at least four months to process an amended return. Do not try to make any changes until that form is available.
The 2020 Form 1040X does not become available until the end of March 2021 (subject to change).
Go to Federal> Wages & Income>>Retirement Plans and Social Security (SSA1099 and 1099RRB) to enter your SSA1099.
https://www.irs.gov/forms-pubs/new-information-for-form-1040-x-filers
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
