If you purchase a 1 month or 3 month subscription to Just Dance Unlimited on the PS4, auto-renewal will be activated by default. If you wish to disable it, navigate to the following:
[Settings]>[Playstation Network/Account Management]>[Account Information]>[Services List]
Locate Just Dance 2016 from the list and then select the 1 month or 3 month subscription you purchased. Select Cancel Automatic Renewal to disable the auto-renewal feature. If you change your mind later and decide you'd like to re-enable it, you can navigate back to the same screen and the Cancel Automatic Renewal button will now say Restart Automatic Renewal. Select Restart Automatic Renewal and you're all set! (Note: a 1 year subscription will not have an option to auto-renew).