Have you ever wanted to change the short username in Mac OS X? Dig around in the System Preferences and you'll soon find it's not as easy as just typing in a new name. Apple has some directions on how to do it, but the instructional document is painful just to look at, let alone implement. Fortunately, there's an easier way here you can follow.

Open System Preferences and click on "Users & Groups"
Select the users name you wish to change from the left side
Look for "Full Name" on the right side options and click in the box, enter the administrator password to authenticate the name change
Type the new name as you want it to appear at the login screen
Exit out of System Preferences

Confirm the login name change took place by logging out or by locking the screen, both of which will bring you to the standard OS X login window. This is the same for OS X 10.7 Lion and OS X 10.8 Mountain Lion.

The full name/login name is not to be confused with the short user name of an account, which controls the directory name and SSH logins.

One of the most important and crucial parts of an account is its password because this ensures security. Even though your system is hardly noticeable, it is still included in the enormous public network when connected to the internet. Shutting down your system when it is not in use is inadequate protection, so it is necessary to create secure passwords.

Your passwords protect all your files in your account, as mentioned earlier as well as your computer and system files. But sometimes you may feel the need to change your password for some reasons such as the knowledge of somebody else, its susceptibility to be traced up, or your failure to remember it. How then can passwords be changed, specifically when you are using a Mac OS X?
Here are the few simple steps to follow to change your os x password:

Log in with an administrator account. From the Apple Menu, choose System Preferences.
From the View Menu, choose Accounts.
If the preferences pane is locked, click the lock button and enter an administrator name and password.
Select the username whose password you want to change.
Click the Reset Password button (Mac OS X v10.3 and v10.4) or the Change Password button (Mac OS X v10.5 or later).
Click in the Old Password box and type your old password.
Click in the New Password box and type your new password.
Type your new password again in the Verify box.
Add a hint if desired; type it to help you remember your password. You'll see that hint the next time you forget your password upon logging in.
Click Change Password.

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