Follow theses simply steps:
Log in to your Finally account.
From the main menu on the left, click Company.
Next, select the Manage tab.
Click on the Billing page.
Under the Linked Accounts section, find the account you want to update or remove.
Click the three dots (...) on the account.
Choose one of the following:
Set as primary to update your repayment account
Remove account to delete the linked account
You must have at least one repayment account linked at all times.