Place the paper on a flat, clean surface
Put a clean cloth or plain sheet of paper over it
Press it gently with your hands to smooth it out
Stack it under heavy books for several hours or overnight
Use a warm iron on the lowest setting
Place a cloth between the iron and the paper
Move the iron lightly and quickly over the cloth
Let the paper cool and dry flat
Use a paper press if available
Store the paper flat to prevent new wrinkles