You have to wait. The 2020 Online version won't open until early December. Keep checking back. Start an Online return here,
Online TurboTax for 2020 returns is not yet open. Check back in early December. If you want to use desktop software (CD/download)
If you qualify AND if you wait until mid January THEN you can use one of the IRS FREE FILE options to file a fed & state return for free ... but you must be patient. https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free
IRS Free File is closed for the 2020 tax season. Check back in January for Filing Season 2021 opening details.
For Filing Season 2021, you must make $72,000 or below to use IRS Free File partner offers.