You will need to create a Customer Admin and an IT Admin.
The Customer Super Admin is the email@example.com account and is created during the installation. It will also be used to configure active directory and create a Customer Admin.
The Customer Admin will be used during install to add the license, configure SMTP and create an IT Admin.
The IT Admin user will be used to connect data sources, configure policies and to visualize data.
Here are four default roles.
Customer Super Admin:
The Customer Super Admin role is the first user logging into the Information Studio product. The Customer Super Admin role is responsible for configuring the customer authentication profile as well as for adding new users with Customer Admin role.
The Customer Admin is a role to which users can be added to give them specific abilities within the Information Studio application. This role is tasked with creation of tenants, users with appropriate roles, and other Customer Admin users for the same organization. It is also responsible for configuring the Active Directory authentication profile, for using their identity provider for authenticating, instead of using default Information Studio provided authentication.
Tenant Administrators are responsible for adding users and assigning various roles per their responsibilities in the organization. Tenant Admin users have permissions to monitor the deployment and the status of the jobs within the tenant. They are entitled to view audits of various actions taken by users under the tenant.
The IT Administrators are in charge of bringing up their organization-specific on-premise Data Engines. These Data Engines are set up to use the Veritas data connector framework, that connects various enterprise data sources (CIFS, NetBackup, and others) to the Information Studio deployment in the context of an organization and enables the end-users to access, visualize, and govern enterprise data assets. Information Studio users with IT Admin role also use the Information Studio application for visualizing data retrieved from connections. They are also capable of setting up policies related to data discovery, scan, and classification which are applicable enterprise wide.
I hope this helps. Check out the Admin Guide Organization section for more details.