I need to redo my return made a mistake

Have you already filed your return? 

If you made an error when filing your tax return, you'll want to determine if the IRS or state has accepted your tax return. You can check your status here.  If the IRS has accepted your return, then you may need to amend your tax return. If your return was rejected, you can correct the reason for rejection and whatever error you made on your tax return and resubmit. You will also receive an email from us on how to fix the rejected tax return/

See these TurboTax FAQ's for more information:

https://ttlc.intuit.com/community/amending/help/how-do-i-add-another-form-like-a-w-2-or-add-change-update-something-after-i-already-filed/00/26779

https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/00/27577

If you have not filed you can use our clear and start over feature in TurboTax but you won't be able to use this if you've already filed, registered, submitted payment or deducted the TurboTax fee from your refund. Please see this TurboTax FAQ for more information: https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-online/00/26444