AJ, your PSN ID is the name that shows in the list of members when your in a room in the online lobby. You can also go to the PS3 Menu page when you turn it on(also when you press the PS button on a controller when your in a game) scroll all the way to the right to friends then scroll down till you get to the list of names. Yours will be the top name in the list. The name that appears on the left hand side under Users is your user name, this is not visible to other people online and is only used by your PS3 to identify who is using the console. You would select this when you fire your console up.
Hope this helps.
Last edited: Jul 20, 2014