If you need to change your bank account or debit card information, you can easily do so by going to your profile icon at the top right of your screen in the FloatMe app.
Tap on "Linked accounts".
From here, you can manage your linked debit card, switch to another bank, or change which bank account is set as 'primary'. You'll need to set a valid checking account as your primary account in order to receive Floats.