You can add a new bank account from the settings section of your account under “Funding Sources”. From this page, select “Edit” on the top right-hand side of your screen, then “Add bank account”. 

You are required to have at least one primary bank account on file as this will be the default bank account for any distributions you receive.

You should be able to remove any outdated bank accounts once a new bank account has been added and marked as primary.