from https://foundation.mozilla.org/en/donate/help/#frequently-asked-questions <blockquote> How do I cancel or change my recurring donation? Can I change my payment method or my donation frequency? [https://donor.mozilla.org/login/ Access your donation portal here]. Here you can cancel your gift or adjust the donation amount, frequency, date charged and payment method. If you run into any issues you can always [https://foundation.mozilla.org/en/donate/help/#contact-us contact us!]</blockquote> Btw this forum section you posted in is for support of the Thunderbird email client.