To change your card or PayPal on file, log into your TubeBuddy Account - https://TubeBuddy.com/account
Click the blue "Manage" button next to your license on the right-hand side of the page. This will bring up your payment information and receipts.
In the Payment section, you will see the option to "Change Credit Card" or "Change PayPal source"
'Change PayPal source' only provides an option to change the payment source connected to your PayPal account. Please contact email@example.com if you are looking to switch to a different PayPal account.