Some questions about PS3 and PSN.

[Don86]

1.How do you add spacing to your PSN online ID? Is this article correct? -> http://www.ehow.com/how_8591019_put-space-ps3-username.html

2.Can you use a USB wireless keyboard(or a normal usb keyboard) to chat in-game while playing at the same time with a PS3 controller on a game like metal gear online? Or do I need a PS3 keyboard controller attachment?

3.Is it possible to unlink a PSN account with a PS3 console user account? I accidentally logged in with one of my PSN accounts on my brother's user account and now I can't seem to change it to another PSN account. Anyone know why?

Thanks all!