Additional assistance/suggestion from another source:
The only step they omitted is that your basic canvas...
4x6, 5x7, 8x10, etc....must be filled with a color
or an image...and the smaller images layered on top
of it. Otherwise, it will not print the correct size.
The finished image you receive from the online
printer will be the size you specified...4x6, 5x7,
8x10, etc...and you can cut out your special size
images with scissors.
If you are still confused...all I can suggest is that you
experiment until you understand the instructions. I
have uploaded an example of a 4x6 canvas with a
blue background and two 2x3 images. Maybe this
will give you a better idea.
Example
http://tinyurl.com/bn295
Thanks to everyone for their help I will try tonight & let you know either way how it goes. Again THANKS. Dorothy