If you have already filed your return, you are not able to make any changes. If your return happens to get rejected, you can update your bank account before re-submitting your return as well as update the issue that caused the rejection.
If the information you provided is for a closed or invalid bank account, or if your bank rejects your direct deposit, the IRS will mail you a check.
Please see the following TurboTax FAQ for assistance with updating your bank account before filing. https://ttlc.intuit.com/replies/4083015
This TurboTax FAQ explains what to do after you filed and need to update your bank information.
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