You needed to put in your 2020 W2's. Then the program would have added up your 2020 income and given you the opportunity to use the 2019 earned income amount instead.
If your file is rejected by the IRS, then you can fix the error before you submit it again. But if your taxes are accepted by the IRS, they may contact you if the W2's do not match what your employer(s) submitted to the IRS in 2020.
You will need to file an amendment and delete the 2019 W's and replace them with the 2020 W2's.