Instructions
Turn on your PlayStation 3 and select your user name from the available menu. Press the ̶0;X̶1; button on your PS3 controller to log in to your console.
Highlight your user name in the ̶0;Users̶1; menu of the PS3's XMB home bar. Press the ̶0;Triangle̶1; button on your PS3 controller to open the available options. Scroll down to ̶0;Information̶1; and press the ̶0;X̶1; button on your PS3 controller.
Select your user name beneath the user icon to highlight the text. Press ̶0;X̶1; to open the on-screen keyboard. Use the on-screen keyboard to input a new name for your profile. Highlight then ̶0;Enter̶1; key on the keyboard and press the ̶0;X̶1; button twice.
Press the ̶0;O̶1; button on your PS3 controller to go back to the ̶0;Users̶1; menu. Your user name change is saved and displayed.