Cut the printed sheet apart into separate images, if you've printed more than 1 per page. Make sure your images are printed in reverse, or mirror-image, transferring will reverse the printed image.
Place image face down on desired surface. Moisten the foam brush with Citrasolv (a little goes a long way!), and rub the brush on the back of the image, being careful not to shift the paper.
Once the paper is dampened with the Citrasolv, vigorously rub the back of the paper with a burnisher or old spoon. TIP: use a scrap of batting or old mousepad for a padded surface and a better print.
Lift up a corner of your printed paper to peak and see if the image is transferring. If it isn't, let go of the corner and resume burnishing. If it has transferred, remove and discard the paper.
If you allow the transfer to simply sit, the Citrasolv will evaporate in a few hours. If you are in a hurry, cover the transfer with parchment paper and press with a warm iron in a ventilated area.
This type of transfer only works with toner-based photocopies or laser prints, not inkjet prints. I prefer Citrasolv because it is a natural and non-toxic solvent. Other solvents may work. Experiment!