Yes, the free trial gives you seven days to stream the on-demand content. If you don't cancel your account before the seventh day, your payment-on-file will automatically be charged the monthly subscription rate ($5.99/month) and will continue to renew monthly until you cancel. 

If you purchase through an app store, you will have to manage your subscription on your device. If you purchase through, you'll have to log in to your account to manage your subscription.