You will need to file an amended return in order to include the Social Security income. However, the form required for amending (Form 1040X) is not yet available in TurboTax. It is typically ready toward the end of February or early March.
Keep in mind that when you work through the amended return, there may not be any changes unless part of your Social Security income is taxable. Sometimes it is not taxable depending on your other income.
See the following TurboTax article to learn more about amending returns:
How to File an Amended Tax Return with the IRS
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