Unfortunately, the only way to change your payment method is to cancel your subscription. Please follow the steps to cancel the subscription according to your payment method here: https://help.crunchyroll.com/hc/en-us/articles/204538129-How-do-I-cancel-my-membership-
You will need to wait for your current paid period to end. During this time, your account will transition to a free status.
Once your account is free, you will need to resubscribe to the desired plan here: crunchyroll.com/welcome, and on the checkout you will be able to add the new payment method.
I cannot add the new payment method, what can I do?
If you are running into any issues adding your new payment method, please review the steps in the following article: https://help.crunchyroll.com/hc/en-us/articles/18505284848148
To find more FAQ’s and knowledge base questions and answers, access the rest of our knowledge base.
If you still need further help, need something changed regarding your account, or would like to contact us directly, please contact us with the details.