Just about every type of paper available has been used to print postage stamps. In some cases, the specific type makes a big difference in the printing process as well as the value.
The most common way is soaking. Place the stamp and paper in water and allow it to soak until the water is penetrated it. After about 10 or 15 minutes, it should slide off. Dry the stamp face down or...
The most common process is by soaking. Soak the stamps in cold water. After about fifteen minutes, most stamps will slide off of the paper. You would then dry them on blotting paper or towels. Weight...
Tear the piece of paper which contains the stamp. Place it into a basin of water, until the stamp falls off the paper. Dry the stamp and remove the glue on the back of the stamp if need so.