Sorry it's too,late to start an online return, either on Turbo Tax or the IRS.
To do a prior year return you have to buy the Desktop program here,
You will need a full Windows or Mac to install it on.
If you have a simple return and want to file for free you can fill out the forms by hand. Here are some basic forms.....
Here is the 2020 1040 return
or if you want bigger type use 1040SR for Seniors,
2020 1040 Instructions
2020 EIC and Tax Tables https://www.irs.gov/pub/irs-pdf/i1040tt.pdf
Don’t forget your state. And you will have to print and mail your returns. So be sure to attach copies of your W2s and any 1099s that have withholding on them. You have to mail federal and state in separate envelopes because they go to different places. Get a tracking number from the post office when you mail them for proof of filing.
Sorry but the FREE online service has closed for the 2020 tax year. You can either use a downloaded program, employ a local tax pro or fill in the paper forms you can get from the IRS and your state.