Add an Administrator Account
The final step in activating Tableau Server is to add an administrator account. The administrator will have all access to the server including the ability to manage users, groups, and projects. Adding an administrator account differs depending on whether you are using Active Directory or local authentication.
If you are using Active Directory, type the Username and Password for an existing Active Directory user who will be the administrator. Then click Add user.
If the administrator account is in the same domain as the server simply type the username without the domain. Otherwise you should include the fully qualified domain name. For example, test.lan\username.
If you are using Local Authentication, create an administrative account by typing a Username, Display Name, and a Password (twice) of your choosing. Then click Add user.