One or multiple new users can be added by going to the User management section of the platform that can be found in the left side menu and selecting item Users. From there, you can click on the Plus button and fill in necessary fields to add a new user. First name, last name and email are necessary fields. If you want this user to be able to change your organization settings and add more users, check the field Superadmin.
By clicking on the See details option in the Action menu, you will open a detail view for each user - where you will be able to see all their information as well as the teams they belong to.