In here, you can view your subscription plan and change it. To change your subscription plan:
Click on Manage Subscription button.
Select the Plan you want to change to. You can select monthly or annually (with 20% off).
Click on the Proceed to Checkout.
You can also change your plan just by selecting one of the plans that is listed in the main page:
You can change your Company Address and add Payment Method on the main page of Plan & Payment.