Where do I go to enter the bank account number and routing number for Bank Code A?

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Where do I go to enter the bank account number and routing number for Bank Code A?    We finally have a bank account setup with my bank, and I need to enter this information for Bank Code A.  Under Bank Code Maintenance, Bank Code A, the "bank account number" is blank and grayed out.  Everything else there is filled in.  Where do I go to enter my routing number and account number?

Thanks.