Subscription and billing is located in the “My Account” dropdown menu in the top right hand corner.
You can view your plan, how many queries you have made during the month, and when this will reset to help you manage your usage within your plan.
If you need to make more queries than your plan allows, you can go over your allowance for a small cost per query. Check out pricing for details.
If you want to take a look at your invoices of change your payment details, hit the invoice button. An invoice will look like this:
If you chose to cancel your billing method you will automatically be downgraded to the free plan at the end of the cycle.