Following are steps for securing your account settings in Mac OS X versions 10.3 and higher:
1. Click on the Apple icon in the upper left corner of your screen.
2. Click on System Preferences (fourth choice on the dropdown menu).
3. The System Preferences menu will open. Click on the Accounts icon (under System heading).
4. The Accounts menu will open. To make any further changes, you will need to make sure the settings are "unlocked" and can be modified. To ensure this, click on the Lock icon in the lower left corner.
5. An "Authenticate" screen will open, and ask for your name and password. Use the same information you use when you log in to your computer. Then select OK. You will now be able to modify your account settings.
6. In the Account menu, click on Login Options, which is toward the lower left corner, and is denoted by a house icon.
7. The Login Options window will open. You will want to ensure that "Display Login Window as: List of users" is selected, but that all other items are deselected (see below).
8. You are done with the Accounts menu, and can return to the System Preferences main menu. To do this, click on the Show All icon in the upper left corner.
9. Select the Security icon in the upper right corner, under the heading Personal.
10. The Security menu will open. The following items should be selected on this menu:
- Require password to wake this computer
- Disable automatic log-in
- Require password to unlock each secure system preference
11. To finish this process, click the Lock icon in the lower left hand corner.