Heat an iron to a medium/medium-high heat. Lay the image face down on the area you want to transfer your image onto. Pressing the iron down firmly and in small circular motions. This step can take anywhere from a few seconds to a minute or more depending on the image and the age/quality of the toner.
Carefully lift and check to see if your image is transferring. Repeat until satisfied.
Tip: Use the edge of the iron to burnish the image off onto the other surface. The words in this piece were a heat transfer.