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While you would probably best served doing the reading yourself and figuring out how all this works instead of spamming with questions that have been answered a million times before, I will continue your spoon-feeding:
Originally Posted by BanditPS3
Which Multiman to install is really up to you. Base if you just want the app. Full if you want covers and themes for it.
Put in on the root of a usb device and install it from the install package files in the game menu of the xmb.
Any other help you should find yourself in my opinion. Search is your friend.