Our customer support team can not modify your payment method or billing schedule on your behalf. That’s for your protection.
The subscription will charge your default payment method automatically, unless you manually change or cancel your subscription.
You can change your billing schedule or cancel your subscription in your Account page at:
Login your account, you should see the page as below:
Click the ‘Subscription’ on the left, will show all your subscriptions, click the one you would like to show the detail:
In the detail page you can Cancel or Change your subscription on this page: