How to Turn Off the Password on a Macintoshby Jedadiah Casey
Apple's Mac OS X operating system is based on UNIX and uses the concept of user accounts to create individual profiles. Each profile maintains its own separate set of files and settings on the computer. In many cases, the account is secured with a password. The set password protects the files and settings on the computer so users without the password are unable to access them. The password is removable if this security is not needed.
Click the "Apple" logo in the upper-left corner of the screen.
Click "System Preferences."
Click the "Accounts" icon.
Click the "Change Password" button.
Enter the existing password into the "Old password" box.
Leave the "New password" and "Verify" fields empty and click the "Change Password" button to remove the password from the system. Click "OK" when warned about the lack of a password.