You may not have any taxable income even after entering your social security benefits. First, SSI is Supplemental Security Income and is not reported on a tax form and is not entered on tax return and is not not taxable. For other social security payments including disability payments you would get a 1099-SSA showing the benefits you received in the tax year.
You would enter that information in the "Retirement" section of the "Income" tab in the federal interview. You can check line 6a for anything entered there and 6b will show the taxable amount, if any, of the benefits entered.
TurboTax will do that calculation for you. Generally, if 1/2 of your social security benefit is added to the rest of your income and the total is below $25,000 none of the benefits are taxable. If the only income you have is social security it will not be taxable and you do not need to file a return or do an amendment to add it to a return already filed.
If after checking your copy of your form 1040 and line 6a is blank, but you had other income sources then you should wait for your original return to process with the IRS. They will normally catch missing income items because they are reconciling with the income forms they received for your social security number like a 1099-SSA.
If you didn't report it on your return and some of it is taxable they will send you a letter with instructions on how to correct or just agree with their findings.
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