Payable Options - How to update them

We are switching banks.  I am attempting to get the new bank to show up for a business unit when I create a voucher for an existing supplier.  I've found the 'Set Up financials/Supply chain > Business Unit Related > Payables > Payables Options' but this doesn't seem to allow me to add the new banking information or to inactivate the old methods.  What am I missing?

Thanks,

Karin