Pages 08 - Postcard Templates

Hello...

I would like to make a 5.5 X 8.5 postcard. The templates are 4.25 X 5.5. I dragged the lines out for my dimensions, but there remains 4 templates at the original size.

How do I create a 5.5 X 8.5 design that I can upload to a printing company?

Thanks so much for your response.