how can i cancel my subscription

It is probably a non-renewing subscription then, and you don’t need to cancel it.

If you purchased a renewing subscription, it is managed in the App Store app as described.

i can,t see the subscriptions but i already bought it

https://support.apple.com/en-us/HT202039

I accidentally bought it, Mac OS

1. Most subscriptions are non-renewing and don’t need to be canceled. Are you sure you purchased a renewing subscription?

2.. Is this on Windows or MacOS?