You can turn off auto-renewal for any iOS subscriptions through your iTunes Account, take a look at this guide.
The login email/password combination will be the same one you use on this website. If you cannot remember your password you just need to request a Password Reset. We'll email you with a few instructions.
To login to our mobile app using your account all you need to do is set a password and email address. To do this click Edit Profile in the navigation above and set your password.