Remove any protective paper or covering that's been rolled with the rug, and lay the carpet out flat in on open space.
Thoroughly vacuum the rug to remove dust that may have settled in the nap during storage.
Roll the rug in the opposite direction to the one in which it was rolled for storage. Roll it tightly and then unroll, pressing it smooth as you go.
Steam out wrinkles or creases with an iron set on "wool." Press the iron with the nap, never against it. Rub your hand along the carpet to determine which way the nap runs. The direction in which the pile feels smooth against your hand is "with the nap."
Contact a rug-care professional about sizing and blocking your area rug if it is severely wrinkled or stretched out of shape.