Instructions
Turn off your modem. Leave it off for two minutes before restarting it. This power-cycles the modem and restarts your Internet connection.
Press the "PS" button on the controller. The PlayStation 3 XBM (XrossMediaBar) launches.
Click the "Users" tab.
Click "Create a New User Account" and then press the "X" button on the controller.
Enter a name for the new account.
Log-in to the new account.
Click the "Friends" tab.
Click "Sign up for PlayStation Network" and press the "X" button on the controller.