You need to consult with a local tax professional. 2020 returns are extremely late at this time and there are severe penalties for late filing of S corporation returns (which can be ameliorated).
See https://taxexperts.naea.org/listing/service/corporations
Otherwise, you can use the 2020 edition of TurboTax Business for your 1120-S and then a TurboTax personal tax preparation product for your 1040.
See https://turbotax.intuit.com/personal-taxes/past-years-products/2020
