How replace refrigerator freezer door gasket?
To replace a refrigerator gasket, you need a new gasket, Hex Head Wrench, rag and Vaseline or other petroleum jelly type product. Open up your new gasket and lay it on the floor in a warm area so that it "relaxes". Go to http://cre8tor.hubpages.com/hub/How-to-Replace-the-Gasket-on-a-Refrigerator-Door for details.
You can buy new gaskets at Home Depot and they are helpful in giving instructions.