You can cancel monthly subscriptions, which renew automatically, at any time by visiting the Subscriptions page.
Yearly memberships don’t have a cancel because they will just end after a year and they won’t renew.
Lifetime memberships don’t have a cancel option because they last forever.
Also, please don’t ask @Bryukh support questions. His job is to make more awesome things for you to play with/in (pets, hero abilities, levels, etc) and if he comes here to answer, you’re slowing down his work!
If you’re looking for help, you should summon me with an @maka.