You can invite users to your organization. Invitations will be sent to specified email addresses. They will be added to your organization only based on their approval.
Zoho Docs provides three user roles.
By default the user who subscribes for Zoho Docs and sets up the organization is the Super Admin of the organization. Only the Super Admin has access to modify the Subscription details of the organization. Also, the Super Admin can only make another user as the Super Admin to the organization.
An admin can change organization settings and manage user accounts and data. The Admin can perform all the actions like Creation/ Deletion of users, Reset Password, Disable/ Enable users, Manage/restore files and folders.
The users do not have access to the Admin console. They can however access their accounts and manage their personal settings.