How to Reinstall a MacBook (10 Steps)

Back up all your data to removable storage, such as an external hard drive, CDs or DVDs.
Insert the Mac OS X Install DVD that comes with your MacBook. Double-click on 'Install Mac OS X' when the window opens. Click on the blue 'Restart' button when the next 'Install Mac OS X' window opens, indicating that your computer will begin the installation process.
Enter the administrator level user name and password when the 'Install Mac OS X requires that you type your password' dialog box opens. Click 'OK.'
Select your language preference from the list when the MacBook restarts. Click on the blue forward arrow button to continue.
Note the 'Leopard Installer' window that opens. To install Mac OS X, click continue. Agree to the terms of service on the license agreement, and then click continue.
Select a destination for Mac OS X by clicking on the icon of the hard drive.
Click on the 'Options' button and choose an option for installation. Select 'Archive and Install' if you wish to install a new version of OS X but leave your old system files and move them to a new folder called 'Previous System.' This will allow you to recover your files if you change your mind.
Choose 'Preserve User and Network Settings' if you wish to save your user accounts and home folders.
Select the 'Erase and Install' option to permanently wipe your hard drive clean of all data, system files and folders. Click 'OK' and continue. Installation will begin and your computer will restart when completed.
Reinstall any data you have lost by inserting your backup data disks or reinstalling from the external hard drive.
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How to Update Firmware on a Mac OS X

Click the Apple menu and select 'Software Update' from the drop-down menu. This launches the App Store and automatically sends you to the Updates section. Provide an administrator username and password, if you receive a prompt requesting the information.
Click the 'More' button next to any OS X Update package in the Update section and read the update description to see if any OS X Update packages contain the latest firmware.
Select the 'Update' button next to any options that contain firmware updates. Alternatively, click the 'Update All' button to update all available software. You may need to provide your administrator username and password again.
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How to Make a MacBook Not Shareable

Log in to your MacBook using an administrator account.
Click the 'Apple' logo from the top menu and select 'System Preferences' from the drop-down menu. The System Preferences window launches.
Click 'View' and 'Sharing.' The Sharing window launches.
Click 'File Sharing: Off' and click 'OK.'
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How to Reset a Lost Password on a MacBook (7 Steps)

Log out of your user account. Click on the 'Apple' menu, then scroll down to 'Log Out.' Click the blue 'Log Out' button when the confirmation window asks if you are sure you want to quit all applications.
Log in with the system administrator account and password. Choose 'System Preferences' from the 'Apple' menu. Select 'Accounts' from the 'View' menu. Click on the padlock icon. Enter the password for the administrator's account.
Click on the username whose password you want to reset, then click 'Change Password.' Type a new password in the 'Password' text box, then type it again in the 'Verify' text box. Create a hint to help you remember it next time, if desired.
Click 'Change Password.'
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How to Set Parental Controls on Safari (9 Steps)

Go to your computer's System Preferences window and choose 'Accounts' from the available options.
Click on the padlock icon in the bottom left hand corner of the window in order to allow changes to your account.
Type in your administrator username and password in order to unlock your preferences.
Choose the account you would like to modify from the list of users and click on it. This will bring up a list of the programs on your computer that can be configured.
Put a check in the box next to the Safari icon.
Click on the 'Configure' button to the right of the icon and press 'OK' when asked if you want to open Safari.
Type in a Web address for a site that you want to allow your child to visit. Although it won't display the page, Safari will ask you if you want to add this page to your child's bookmarks bar.
Click on 'Add Web site' to set the link.
Repeat steps 7 and 8 for other Web sites you want your child to be able to access.
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How to Switch Between Users on a MacBook (5 Steps)

Click the 'Apple' menu, and select 'System Preferences.'
Click 'Accounts.'
Click the 'Lock' icon, and enter an administrator user name and password. Then click 'Login Options.'
Click 'Show fast user switching menu as:' Select whatever display option you want.
Click the current user name in the menu bar when you want to switch accounts. Select a user account to switch to from the drop-down list.
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