How to Cancel Ventusky subscription

Please tell me, IN DETAIL, how to cancel a ventusky premium subscription. I can not find much information about that.
Whom would I contact, how soon in advance, etc?

clockwatcher
For each subscription in the overview, you have a link to Manage, and in the respective system, there is always an option to cancel. Further help can be found here:

https://support.apple.com/en-us/118428
https://support.google.com/googleplay/answer/70184...

Ventusky
Thank you. Much appreciated.