After the first 3 months of your subscription, you can change the duration of your subscription. Should you want to change your subscription for a shorter duration, you would have to pay the difference in the fee that you benefited from by taking out a subscription for a longer duration. In other words, if you take out a 24-month subscription and, after 6 months, decide to reduce it to 12 months, you will have to pay the difference between the 24-month and 12-month subscription for those 6 months of subscription already taken.