User name : The user name as reported by the printer driver as a print job is logged. This is the same as the name the user is logged in as. On a network with a domain, these names are listed on the domain controller. On a network without a domain, the names are user defined. If users are not logged on to the network, yet still can print (ie; there is no network security), the username is recorded as Anonymous.
You cannot add a new user in the web interface.