Using a camera, enlarger, slide printer or Day Lab, expose Polaroid film. You need pull-apart type film, such as Polaroid 669 (now discontinued), or Fujifilm FP-100C (which is readily available). Develop by pulling the film from the holder. Wait about 10-15 seconds and quickly pull the film apart, not letting the two sides (the picture and the negative) touch. Put the pulled apart negative face down on paper (or other material). Place pressure over negative and let sit for about 20 minutes. Then pour hot water over each side of the negative/paper sandwich. Gently peel the negative from the paper. Allow transfer to dry, face up.
Slide printers allow you to make Polaroid transfers from previously-taken slides or negatives.