How to Unlock a MacBook Without a Password

Insert the Mac OS X install disc in the MacBook and restart the computer. Hold the 'C' key while the computer starts to force it to start from the disc.
Choose your language and click the 'Arrow' icon. Click 'Utilities' and select 'Reset Password.'
Click the hard drive in the window to select it. Click the username for the main account in the drop-down menu. Type a new password, then re-enter it in the confirmation text box. Type a password hint for the account. Click 'Save.'
Click 'OK' on the confirmation pop-up window. Click 'Installer,' then 'Quit Mac OS X Installer.' Click 'Restart' to reboot the MacBook.
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How to Reset MacBook Firmware

Power on the MacBook and wait for a warning message that reads 'To continue booting, type 'mac-boot' and press return' to appear on the screen. The firmware on your MacBook must only be reset in the event that this message appears.
Enter 'reset-nvram' in the prompt following the warning message. This resets the non-volatile memory on the computer. This type of memory does not lose information when the computer is reset.
Press the 'Return' key.
Type 'reset-all' at the next command line prompt, and press 'Return' to reset the firmware on your MacBook. This also forces the computer to restart.
Wait for the MacBook to reboot. By the time the laptop restarts and boots into Mac OS X, the firmware is successfully reset.
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How to Clear an AutoFill on a Macbook (4 Steps)

Launch Safari from your desktop and click the 'Safari' button located at the top of your browser. Scroll down the pop-up menu and click 'Reset Safari' to launch the 'Reset Safari' window.
Uncheck all the options except 'Remove other AutoFill form text.' Click 'Reset.' Safari deletes all the AutoFill information you have used on your browser.
Turn off AutoFill if you no longer want to use it. To do so, click the 'Safari' button on your web browser and click 'Preferences.' Click the 'AutoFill' button. You should see 'AutoFill Web Forms.' Uncheck the following options to disable AutoFill: 'Using info from my address book card,' 'User names and passwords,' and 'Other forms.'
Close the browser preferences window. Safari will no longer automatically fill in forms.
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How to Clean and Clear All Internet Track History on a MacBook

Open the 'Safari' menu from the Web browser.
Select 'Reset Safari.' A window will open listing reset options.
Place a check mark in each reset option check box depending on what you want to reset.
Click the 'Reset' button in the dialogue window.
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