If you submit your return with incorrect banking information, you can only correct the error if the return is rejected. If the return is accepted, the IRS will mail you a printed check once they discover that the account number is not in your name. See Fixing Incorrect Routing Number After E-file for more information.
To fix the banking information in a rejected return, click the Filing tab and repeat the filing steps. On the screen titled E-Filing - Federal Refund Options click Direct Deposit. Fix the error and complete the remaining steps. You must click Submit at the end for your return to be re-transmitted.