grayed out buttons for margin and orientation on page layout

[rin tin tin]

i'm new to microsoft office and i need help with excel 2007, i'm trying to
change my margins to fit the page and rotate the orientation to landscape,
but everytime i go into page layout tab, the those two buttons are grayed
out. i can't change these settings, i tried opening a new workbook and i
still can't change these settings,what am i doing wrong??

 

[Bernard Liengme]

Do you have a printer installed? You do not need a physical printer; you can
just install driver for one and let Excel think you have that printer.
best wishes