You can easily add or remove any card in Smash.
To add an additional card go to:
Account Settings -> Linked Accounts -> Add additional account (+) -> Select your bank and log in
We have a wide range of approved banks and cards across the United States. If you can’t find your bank for any reason, please ping us at email@example.com, and we will do our best to get it into Smash!
To disconnect any card you have in Smash go to:
Account Settings -> Linked Accounts -> Select a card you want to disconnect -> Click Disable (-)