For the sake of SEO I'm going to restate the response above:
If you have already filed your return, unfortunately you can't change your bank account information.
Change your info prior to filing/paying the fee next year.
Note to the design/engineering team:
Just a heads up you might want update the UX here to explicitly ask if the user wants to update their direct deposit information here. It seems like the likelihood that someone would know they need to update their personal bank information on your website prior to submitting the tax return is very low. I assume your Insights team is phenomenal as the site has improved year-over. hopefully they find this pain point sufficient to warrant changing the order of the bank info and filing.
Regardless of the mishap glad to file with Turbo tax and look forward to doing so again next year.
