You can manage your promotion from your business account interface. We will send you login and password for your account right after payment. Then you will have to claim access to an existing listing or create a new one. Once you’re done with that, you’ll be able to manage your listing in the business account. Go to the «Subscriptions» section of the interface, and you’ll be able to cancel your subscription or choose a new plan that suits you better.
You can also read more here