How to use Photoshop to prepare a photo for printing on canvas?

Nikon.D.200.

New member
I'm going to have this picture of mine uploaded onto a website and they will print it on canvas and have it stretched on a wooden internal frame. Now, for the stretching, Im supposed to "repeat" the image so i don't loose some of the image. Does anyone know how to do that in PS Elements? And i've also heard that you have to do some tweaking in contrast/saturation/etc. ...is that true?
 
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