Sorry it's too late to change it after you filed. Unless your efile rejects , then you can fix it and resend it. Do not amend to change the bank account. If you need to amend for something else you should wait until the original return is Accepted and the IRS is done processing it and you get the first refund or pay the tax due.
If the bank rejects your refund deposit they will send it back to the IRS and the IRS will mail you a check.
