Instructions
Load the "Call of Duty: World at War" game disc on your PlayStation 3 console and select "Multiplayer" from the main menu.
Choose the "Online" option from the Multiplayer menu and select "Clan Tag" from the following menu.
Use the onscreen keyboard that pops up to type "Rain" into the text field and then click the "Start" button on your PS3 controller.
Press the "Back" button to return to the Online menu and then join a match. "Rain" has now been set as your clan tag and it will begin working as soon as you start playing.