I agree.  Turbo tax didn't accept any info I submitted.  I completed the form, and now it's saying I'm getting a $0 return.  

You will not be able to Clear and start over after you have registered your account.

Make sure that you delete as much information as you can find in the tax return.  Most items in TurboTax have a trashcan icon to their right that can be used to delete data.

An example follows: 

• Click on Federal.
• Click on Deductions and credits.
• Next to the expense to be deducted, click Edit.
• Depending upon the item, you may need to scroll through one or more pages.
• Click the trashcan icon next to the expense to be deducted.
• Confirm deletion by clicking Continue.

After deleting all of your data, you can log out.

See additional information.

I no longer need Turbo Tax and wish to cancel my account.

You can not delete or merge accounts.

You can try to clear all of the information in your TurboTax account for this year but you will need to Contact Customer Support  to have an account deactivated for more of a resolution.

https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-onli...

I have paid cant file because im using adjusted gross from 2019 how to get 2020 filed

There are a few ways to obtain your AGI or double-check this information. Please see the Help Article here for further instructions.