How Do I Cut The Page In Half To Make The Document Not So Big?

[BloodRedWall14]

im trying to make a picture collage for buddypic.com but the document even
with only like 6 small pictures is too big. how do i cut the page in half of
all the empty space so it wont be so big?

 

[Suzanne S. Barnhill]

See reply to your previous duplicate question.