If you were eligible for earned income credit it would have been added to line 27 of your Form 1040 automatically.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/qualifications-ea...
https://www.irs.gov/credits-deductions/individuals/earned-income-tax-credit/use-the-eitc-assistant
https://www.irs.gov/pub/irs-pdf/p596.pdf
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