Editing Rulers

So we sell Universal Lasers, and we have to spend about an hour over the phone trying to explain to customers how to set up Corel if they won't let us remote in using some other software.

I have the page size correct

I have the color management settings correct

How does one affect the rulers? We need to set the origin of the rulers to be 0 0 in top left, 0 0 is usually the bottom left. I tried activedocument.rulers and that just sets the units, i.e. cm inches feet yards.

I know this is probably really easy but I overlook things a lot!