HELP! Printer - Paper Size Setup


I’m in a bit of a pickle and Im hoping someone can help me and fast.

Basically I have borrowed a printer (HP Photosmart 8205) from the Parents in Law and I am trying to print something out on a piece of paper the size of 145mm x 145mm.

I have set Microsoft Word up so the Printer Page Properties are the size I mentioned above however the page seems to print to one side of the page and not the center of the page.

If anyone can help it would be very much appreciated.

drag the image to center in preview to print in center