Canon Pixma MP780 + CUPS in my local network doesn't works for my PC

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http://chakra-project.org – Hi,We've some computers @home, one on ArchLinux and two on Chakra (last release).The printer (Canon MP780) works for one ArchLinux and one Chakra computer. But for my Chakra it doesn't. My roommate on Chakra has used the KDE interface to install the printers from the network. I've installed the same things than him but he've forget where is it in the KDE system config and we doesn't found something about printers.So I've decided to use CUPS from http://localhost:631 but when I'm adding a printer it doesn't works, with a real test or the print page test.T (HowTos)