user name

i need to now how to creat a user name can any one help me?

Are you tallking about Live CD or installed on hdd? In Live, you don't need one, I think. In installed on hdd, you must write one during installation. So, I don't have an idea what do you realy need.

in live cd

You should not need a new username while using the LiveCD? Is there any more info you could provide to describe what you hope to accomplish?

In a root terminal type adduser [i]newuser[/i, and then su newuser.] to log in new user account.