All your subscriptions are viewable in your account. Just click on your username in the top right corner and select ‘Financial’ from the menu. On the tab ‘Subscriptions’, you can see an overview of ongoing subscriptions.
On the tab ‘Invoices’, you can also view your recurring charges and subscriptions for any Numbers and Keywords that you might have connected to your account and their renewal date.
If you would like to cancel your subscription you can do so in the subscription overview. On the right side you will see a button to cancel the subscription. The subscription will then stay available until the end of your prepaid subscription period.