Changing border size in Photoshop 7

I'm trying to print an 10.75 inch image on 11 inch paper. I keep getting a message saying "the image is larger than the prinable area - some cliping will occur". I know my printer (Canon S750)will print to the edges of the paper as I can print borderless pictures. But when I chose high res paper i can't chose borderless printing. When I choose high res paper I get a margin menu within the printing area of Photoshop that has margins set but those margins settings are grayed out and therefore unavaialbe to me to adjust. Where do I adjust those perameters?? Or is this all a Canon question?? Thanks, Ron

It will be a Canon problem. PS reads the printer specs and uses that to determine the margins. You (as you know) cannot adjust those margines.