At the start of the game you will have 3 options available
1. New Call Sign
If you are continuing a game you can select Load to choose an already existing Call Sign. However if you are playing for the first time you will need to create New Call Sign. A PS3 keypad will display on screen where you will need to create a call sign that is between 1 - 5 characters long. Once you have chosen a call sign, Press Start on your controller or select Start on the keypad and your call sign will be created.