Hello, there is a bug in Cups managing, you cannot manage printers because "user is not in lpadmin groups".
I was unable to setup my printer and i found a workaround of this, but for a newbie user, it can be very difficult.
So it is necessary to open Ovládací centrum (system center in En maybe?), then users and groups(?) and then manage groups. here I found "lpadmin" group, open it and add my login in it.
It should be fixed IMHO in next system update.