If you already E-Filed it, you would have to wait and see if
your return was accepted or rejected.
If the IRS rejects your E-Filed income tax
return, you could change your account number. See
Where do I enter my
bank's routing or account number?
If the IRS accepts your E-Filed income tax
return and it is a wrong account number or routing number, the IRS will
send you a check in the mail. See What if I entered the
wrong bank account for direct deposit?