Help us out a bit. What version of FMP? What OS? Can you show include a screen shot?
Without more information...
In Layout mode, choose View > Page Breaks to see if your footer is inside the page size.
In Preview mode you can also check to see your page margins.
Either adjust your layout so printed objects fall inside the printable area, or adjust (if feasible) your print margins in File > Page Setup... or in Layout mode, Layouts > Layout Setup... Printing Tab check "Use fixed page margins.