Is this a page with 4 post cards on it or just one 4x6 postcard?

If it's the latter, from file go to page set up, and select from paper the
custom size of 4x6. make sure you select portrait or landscape correctly.
then on the margin tab, adjust your margins accordingly.

"Vernon needs help" wrote:

I have a 4"x6" post card that only allows me a printable are of 2.75" width
x4" in length. I need to print a small blurb and i do not know how to set my
margins for this temporary task.

Thank you Vernon