Again you can get 2020 Schedule D in fillable PDF format from the IRS website.
Copy all the items from your filed Schedule D and then add the carry over amount(s) in the correct spot(s).
That's Line 6 and 14.
Redo the arithmetic for the affected totals, carefully.
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Always print a copy of your completed tax return for your records, and review it carefully before e-Filing.
You will need it if you are audited by the IRS, or to amend if a TurboTax update changes your return or for any other reason,
SUCH AS, adding carryover amounts that you previously left out.
AND, to find your AGI next year.
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You don't need any tax software to do this, because you said your $3,000 loss on 1040 is correct.
Keep a copy of your amended return for your records.
