To access your billing screen and make updates to your subscription, log into your account click on your profile image in the bottom left corner of the Appointlet dashboard and select Billing & Invoice:

The Billing dashboard is divided into three sections. At the top is your subscription management button. You can use it to subscribe to a plan or, later on, cancel if you no longer require the service. Below the subscription is your payment method. You'll need to add a debit or credit card to pay for your subscription. Later, when you've accumulated payments, the invoice section will hold those billing records:

Here's roughly what the billing screen looks like once you're subscribed:

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