when i try to play on line mode it says i need to set up a psn account. why does it say that because i already have one. help please
What game are you trying to play and are you signed in to the PSN when you do?
Go to the Playstation Network category of the XMB. The icon on top will either be Sign Up for Playstation Network, or Sign In. If it is Sign Up for Playstation Network, then you haven't configured a Playstation Network account for this PS3 User. That is probably the case, as otherwise the game would have taken you to the Sign-in screen automatically when you selected an online mode. You have to tell the PS3 what your PSN account is. It can't guess what your PSN sign-in name is. When you select the Sign Up for Playstation Network command in the XMB, you will have a choice of creating a new PSN account, or specifying the sign-in name and password for an existing account. In your case, you probably want to use your existing account.