Things You'll Need
Instructions
Power on your PlayStation 3.
Use the directional pad to navigate through the system menus.
Highlight "Users" in the system menu, then press "X" to confirm your selection.
Highlight "Create New User" and press "X."
Enter a name for your new user account. This name will be used to identify you in online matches of "Modern Warfare 2."
Highlight the newly created user account and press "X." This will set the new user account as your active account.
Run "Modern Warfare 2." Select "Play" from the main menu, then select "Multiplayer." Highlight "Play Online" and press "X" to enter the online matchmaking menu. Use this menu to search for online games. You will automatically use your new user profile when playing online.