ummm guys, you need to go to printer option, AFTER (not before) choosing the right type of paper, resolution, etc, go to the option "print mode" (at least that's available in Canon) and choose "borderless printing" (if you don't choose this, it will ALWAYS default to bordered printing). Then choose the level of bleed you're okay with for the borderless printing (because there is no such thing as real borderless printing, the printer will 'bleed' some of the picture outside the paper. how much bleed is depending on your choosing).
I learned the above the hard way... by reading the manual (I usually do, but for some reasons, I don't read certain types of manuals and printer-manual is one of them) it took me several weeks before realizing that there is "borderless print" option that I have to "check".