Yes, Sign in as the user you want to delete, then hit triangle over the user, and click delete.
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Depends what you want to do, you don't have to be online at all for the PS3 to work.
You can't delete Firmware patches for the PS3, but you can delete game patches through the game data utility.
u cant but there is a limeted amount of history so watch as many as possible to get rid of it
no ,only if you cant get online
you go to the ps3 account station and they will give you the password to your new account. sukka