Problem placing a positioned subform on a flowed page

On page 2 of my form, the page is set to flowed. I have one subform which contains a Save button that I would like to position at the bottom margin of the page. However, I can't get the subform and button to move to the position where I want it. If I select just the button, then I can position using the Y coordinate. That then leaves the subform height too big. When I select the subform, X and Y coordinates are grayed out.

Thanks,

MDawn