If you checkout using a credit card via Stripe, please log in to the YayCommerce dashboard, and you will see the Update Payment Method option below.
There, you can add a new card, and save it for future renewal payments.
PayPal payment gateway
If you've used PayPal balance or Credit/Debit card via PayPal gateway, there's no such Update Payment Method available.
For security reasons, the PayPal integration doesn't allow updating your information within YayCommerce dashboard.
However, you can change your payment details in your own PayPal account. From your PayPal app, go to Payments > Bills and select Link a new bank or card. This allows you to add another card to use in the next subscription renewals.
Switch from PayPal
In case you do not wish to use PayPal anymore, please do the 2 steps: