I did not e-file, I printed my return. I did not mail them, I'd like to add a couple things to add to my Schedule C. How can I add this information.

See the following steps to get into your return, then you can add information to your return.  You can also change to e-file if you want.

1. In TurboTax Online, sign in to your account.
2. Select Tax Home in the left menu.
3. Scroll down to Your tax returns & documents.
4. Select 2020, and then select Add a State (you're not actually adding a state, this just gets you into the right area).

Once you follow the above steps, you can navigate back to Schedule C.

1. Type "Schedule C" in the search field at the top right hand of the screen.
2. Select "Jump To Schedule C" and you will be brought to the section of TurboTax where you can enter or have entered your business income and expense information.

Click the Edit box next to the section you want to add information to.