Cancelling

Are NL purchases one time only? Meaning I have to go to a site and buy it again or will it constantly renew if I don’t cancel it? I am asking because I can’t seem to find the cancelling, where is it? Also if I cancel will I be able to use it until it lasts or cancels instantly?

Thank you for your answers in advance!

There is no auto-renew

no auto-renew possible