New users are added through the settings of the organization.
Open the settings by clicking on "Organization Settings"
Right after selecting the organization settings, the existing members of the organization are listed. By clicking on "Invite New Member" you can choose between different user roles for new users. There are four different user roles: Administrator, Member, Guest, and External. While an administrator can change all the settings of the organization and use all features, the other user roles have only limited rights available.
Each user is added with a specific user role to an organization
If a person has not created an account on Stackfield yet, it's possible to send directly an invitation to the email address. Keep in mind that you need to purchase enough licenses before new active members can be added to the organization. Once the invited user accepts the invitation, he will be added to the organization.
Send invitation to a valid/active email address