1)You need to get the kamael client :O
2)Go to C:/windows/system32/drivers
3)There should be a file named hosts.Right click,select properties and uncheck Read-Only.
4)Then open it using Notepad and add
78.46.44.76 http://l2authd.lineage2.com
216.107.250.194 http://nprotect.lineage2.com
at the end of the file.
5)Save it.
23)Enjoy.