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I am new to macbook pro. A few weeks ago I bought used macbook pro. I tried to change user name and it looks somewhat well. But when I open my iterm2, something that I don't want is wroten(MBP085ui). My user name is bmy4415 and MBP085ui is not I want. And this also appears in my default screensaver. ScreenShots are below. How can I change MBP085ui to my custom name? And What is the official designation of that(for eaxmaple, It's username or It's unique name of device)
p.s I also changed my 'account name' and 'full name' from 'User & groups' tab.