we can't see the rest of the return or the returns for 2020/2021/2022
in 2019 the capital loss on line 6 of the 1040 should be -3000. if you substitute 0 for that and line 11 of the 1040 is positive you would have used the lesser of the positive amount or 3000. the c/o to 2020 would be short-term 8990 less the amount used and long term 13304
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in 2020 repeat above. short-term is used first up to the 3000. if your preparer omitted the clco from the return you'll need to amend or if he's still around he should do it for free. the amended return must be filed by 4/15/2024 otherwise it's unknown if the IRS would allow the clco. Any 2020 capital gains and losses must also be taken into account
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in 2021 see 2020 same rules
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in 2022 see 2020 same rules
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any remaining clcos are then entered in Turbotax
we have no idea of what the proper carryovers are since we have no info other than schedule D for 2019
for better instructions we need to see 2020,2021,2022 schedule D
and what's on line 11 of those years. and 2019
