I need an account to be used by several people in my organization. How do I purchase it?

You can buy either a Multiuser Account or Subaccounts for your master account. To do that, move the pointer to your name in the upper-right corner of the screen and go to Account add-ons.

Please note that your subaccount and multi-user account users cannot purchase the add-ons. These can only be purchased from and for the master account.