Can I file my taxes for 20/20 on line.

No. You need to use one of the prior year desktop products; online is not available for the 2020 tax year.

See https://turbotax.intuit.com/personal-taxes/past-years-products

You cannot file a 2020 tax return with TurboTax Online.  You would need to purchase the Desktop (CD/Download) version to prepare your 2020 tax return with TurboTax.  The software is installed on your computer.  You can purchase the 2020 tax software from TurboTax, click on the following link.

https://turbotax.intuit.com/personal-taxes/past-years-products/

If you want to file for free you can fill out the forms by hand. Here are some basic forms…..

Here is the IRS 2020 Form 1040
https://www.irs.gov/pub/irs-prior/f1040--2020.pdf

or if you want bigger type use 1040SR for Seniors,
https://www.irs.gov/pub/irs-pdf/f1040s.pdf

And 2020 Instructions
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf

2020 Tax and EIC Tables
https://www.irs.gov/pub/irs-pdf/i1040tt.pdf

Sch 1 : https://www.irs.gov/pub/irs-pdf/f1040s1.pdf
Sch 2 : https://www.irs.gov/pub/irs-pdf/f1040s2.pdf
Sch 3 : https://www.irs.gov/pub/irs-pdf/f1040s3.pdf

The only hope is there have been a few states that allowed past returns to be filed on state site. I have not used this for years so good chances its gone. If you have turbotax it is still smart to prepare return for accuracy. Check the site for your states department of revenue to see if it is possible for your state