Oh no----did you already e-file it? The online software is only for 2020 returns. You cannot use online for any other year, so if you put income from other years into the online program your return is all wrong. And you cannot combine 2018 with 2019. Each year has to be prepared separately using the forms and software for the tax year in which you received the income. Post back and tell us exactly what you did so we can help.
We need to know if you e-filed and if the IRS accepted it.