You can use the Clear and Start Over Feature to erase and start your return over as long as you have not submitted payment, deducted the TurboTax fee from your refund, or registered.
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Sounds like the return was transmitted to the IRS if it won't allow you to make changes. However, if it was submitted already you can prepare an amended return to make changes to the original return. So if you have transmitted the return already, here is how to amend that return.
When you're ready to amend, find your situation below and follow the instructions.
You must log into the same account and start the return to open the program ... then you will see the tools options. OR you can start a new return in a new account but you will lose the prior year history if you have any.
You have to sign onto the same online account using the exact same user ID you used to create the online account.
Close all TurboTax windows on your web browser (including this one). Copy and paste the account recovery website link onto a new web browser window and run the tool.
Use this TurboTax account recovery website to get a list of all the user ID's for an email address. Run the tool against any email addresses you may have used - https://myturbotax.intuit.com/account-recovery
If none of the user ID's received will access your account, then use the option shown in blue on the account recovery website, "Try something else"