When you are using Windows users, there are no users defined on Starship Server. Starship Server will just ask Windows if it knows the user and let him/her through. You can think of this users similarly to which users can logon to Windows, on which Starship Server is running. The user does not need to have logon privileges, but Windows machine needs to know about them. If you want to add users, you need to add them to Windows users, not Starship Sever. Usually it is best to choose Windows users if your users are already a part of a domain. This way you don't have to do anything, Windows domain users will be able to access Starship Server automatically.
This option also allows you to use Group policy to deploy Starship across your organization. When a user visits the server with a browser, he/she can use Windows account credentials to log in.
There are cases when you need to create Windows users:
If users and server are not part of the same domain
For example, when you have an outside contractor, who does not have a username on your domain. Then you need to create a Windows username for this contractor.
If you want to anonymize the data
Sometimes you only care about machine usage and don't want to know which user the data belongs to. In this case, you would create one user, which all clients would use to send the data to the server.
Go to Computer management (right click start menu, Computer management)
Navigate to Local users and groups, Users.
Right click on Users and choose New user
Set user properties

Once you are done, right click on created user and choose Properties.

