How to Disable Automatic Log in, Mac OS X

This will teach you on how To require all users to log in to the computer:

1. Choose Apple menu > System Preferences, and click Accounts.

2. If settings are dimmed, click the lock icon and type an administrator name and password.

3. Click Login Options

4. Choose Disabled from the “Automatically log in as” pop-up menu.

5. Select the login window options

- To have users select an account from a list in the login window, select the “List of users” checkbox.

- To require users to type their user account name and password, select the “Name and password”