Simply go to atmosphere.com/login and use the email and password that you created when signing up. Once you are logged in, navigate to the Billing section. There, you will see the option to upgrade. Upgrading will begin a 7-day trial period for you to test out your new subscription. After that, you will be billed on a monthly or annual basis (depending on what you chose).
Having trouble? Let your Account Manager know or email us at help@atmosphere.tv!