A user is someone who can build forms, edit form entries, or view form entries depending on their assigned user permission level. In order to invite additional users to your organization, you must have either Owner or Administrator permissions.
You can also invite additional users above the number included with your plan. Your account will be charged per additional user/month for each user above the amount included on your plan level. See our Pricing for details.
Learn more about managing user permissions in our Account Management guide.