Instructions
Disabling User Auto-Login
Sign into your user account through the "Users" tab.
Highlight your username and press "Triangle."
Highlight "Automatic Login" and press "X" to deselect this option. Save your settings and press "Circle" to close the settings menu.
Disabling PSN Auto-Login
Open the "PlayStation Network" menu and select "Account Management."
Highlight the "Sign In Automatically" box and press "X" to clear the check mark.
Repeat this process to deselect the "Save Password" option if you wish to erase your password from the sign-in menu.
Hit "Circle" to close the menu without signing in, or select "Sign In," to log onto the PlayStation Network. Either option will save your settings.