Change username of AutoCAD Civil 3D

Hi! I am new here. I have first question to You. How can I Change username in AutoCAD Civil 3D? I mean in style dialog are informations like "Last modyficied by:". Now it is some strange name of computer.. How I can change this username? I am using AutoCAD Civil 3D.

You have to change your user name in windows. "Last modified by" will show the name of the computer, or the user that modified it last.

Thank You.