Currently, clients can only link one bank account on the bank accounts page. Clients with older accounts may have had the ability to connect 3. If you need to change your bank account, delete the old bank by clicking the garbage can icon on bank accounts page.
If you had a recurring purchase plan with the previous bank account, you will need to re-create it with the new bank by following the instructions here.
Please submit a request ticket here if you have a question!