Completely cover your canvas with gel medium. Use a heavy coat. (Remember, your image will print reversed)
Press the photo copy onto the canvas and let it dry for several hours or overnight.
After your image is completely dry, use a spray bottle to wet the top of the paper. Rub the surface with your fingers until pieces of the paper start coming off. When pieces start coming up your image will be revealed. This step takes patience and is messy! Be careful not to rub too hard as this can remove your transfer on accident. Continue until all the paper is removed and the image is completely visible.
Cover your canvas with one more coat of gel medium to seal and protect the image.
** You can expect an imperfect transfer. It's best to choose an image that is not incredibly detailed to work with. Each transfer is different.