Click on the Draw toolbar, select Rotate or Flip and pick the horizontal or
vertical whichever way is best for you. Is this what you were looking for?

Note that many printers allow you to select this as an option when you
print, so check the options in the Print Dialog Box. That's how I make t-
shirts. The alternative is to save the slide as a JPEG and import it into a
graphics program, like Photoshop.
--David