If you paid with PayPal, you need to change it on PayPal setting pages.
If you paid by entering your card number, you can change from the LINER workspace.
https://getliner.com > The down arrow next to the top profile > settings > subscription > “manage”
In Payment methods, add a new payment method and make it the default.
This must be done before the payment is renewed. You can't change a payment that has already been made.