If you printed your taxes and went all the way through the File section, when you sign in to TurboTax Online you'll see the Way to go! You filed your 2020 taxes and you won't see a way to change to e-filing. As long as you haven't already mailed your 2020 paper return, you can switch to the e-filing method (through October 15, 2021). However, some states now require e-filing, which means the federal and state must be e-filed together.
Please follow the instructions in the link below to E-file your tax return: