To cancel the subscription, you have to go to a platform you are originally subscribed to since we don’t have any control over these platforms:

App Store – https://support.apple.com/en-us/HT202039
Google Play – https://support.google.com/googleplay/answer/7018481?co=GENIE.Platform%3DAndroid&hl=en

I don’t see your email linked to a subscription made via the desktop version. In case you used a different email, type in the email address you used for a subscription here – https://windy.onfastspring.com/account.

Kind regards