Go to Settings.
Go to Billing.
Click 'Change payment method' for the subscription you want to change your payment method for. You can find your invoices here as well when you clock 'Invoices' per location.
In the Stripe session that loads in a new tab you can update your payment method under the 'Payment method' section. You can update your default payment method, or add a new payment method.
You can choose between a creditcard or a SEPA Debit.
If you leave payment method empty your account will be put on hold automatically.