When you first set up your organization, each subscription plan includes one user, but you can add as many additional users as you wish (minimum of two users total). The cost per additional user varies depending on the subscription plan purchased. Each user will have an extra cost per month, per quarter, or per year, depending on the subscription period you select. For a quarterly subscription period you will enjoy a 15% discount, and for a yearly period a 30% discount.
Same as for your personal account, the subscription plans that BigML offers for your organization will be limited by the maximum dataset size and the maximum parallel tasks according to the subscription plan you purchase.