How do you change your name on Yosemite OS X?

Answer 1

Oh, and by name, I mean the account name.

On Mavericks, I was always able to just click on the text box to change my name, but after I upgraded to Yosemite, I can't change the username (full name or short name)!

Answer 2

Have you tried opening System Preferences >> Users & Groups >> and changing the name there? If not, open it and once you are at Users & Groups click your name on the left and then click Advanced Options which will pop up. Now, simply change your name under the section that list Full Name. That is all you need to do.