Go to Federal> Wages & Income>>Retirement Plans and Social Security to enter your SSA1099.
The other part of your question asked about child tax credit and earned income credit. In order to get either of those child-related credits you have to have income earned from working. Social Security income would not qualify for either of those credits. If you have income reported on a W-2 or some self-employment income you may be able to get those credits if you have a child who is your dependent.
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