Once you have setup your organization, adding new users can be effortlessly accomplished within the platform, or from the Forms On Fire website.
From the Platform
From the left side menu of the platform chose Admin and the Billing Account.
Then you will enter your email address and click Next. You will be sent a one time password to your email, enter the code in the space and click Login.
Once you login, you will see the current subscriptions for your account. You will also have access to your Account Information, Billing & Shipping Addresses, Payment Methods and Billing History. To add users to your current subscription click on the active subscription you want to add users to. 
Choose the amount of new users you would like to add then click on Update Subscription
After clicking on Update Subscription you will be asked to confirm your payment. After confirmation you will receive an email with invoice/receipt of payment.
From the Forms On Fire Website
Navigate to https://www.formsonfire.com/ and click on My Account from the top menu, then click on Billing Account. Enter your email address and follow the steps from above.
