EBT said I qualify for a deduction of $6600 since I made less than a certain income. I can't find where to claim this credit on TurboTax.

[SweetieJean]

The may be referring to the Earned Income Tax Credit (not deduction) of up to $6660, based upon your income and number of children.  The program calculates this for you after you enter your dependents in Personal Info, and your income data in Federal > Wages and Income. See:

2020 Schedule EIC (Form 1040) (irs.gov)

The credit appears on line 27 of Form 1040.

2020 Form 1040 (irs.gov)

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[SweetieJean]

I note that you are asking from TT self-employed.  For purposes of the EITC, the IRS  looks at your profit (not gross income) from self-employment, and requires you to claim all of your self-employment expenses.