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If you do not have a copy of your 2020 tax return (be sure to print or save to PDF this year!) and that whole ID.ME business (which the IRS claimed they were dropping as of the end of last March), you should select the paper filing option. You would then print and mail the return. If you are expecting a refund, nothing else to do but mail the return at your convenience this week. If your return shows you owe money, then you should go to the IRS website https://www.irs.gov/payments and pay the amount owed before midnight tonight. Ditto for any state taxes that are due.