Before taking your freezer door off, do a quick check to make sure the gasket size is correct. Recommend to wipe clean the gasket and place it flat on the floor. Make sure no there is no damages to the gasket. Use the heat gun (hair dry) to flat out any kinks/twists in the gasket. Take freezer door off and place it flat on the floor. If you're not use to this type of work, take note of how the old gasket oriented and stalled on the door. Loose up all the screws around the frame, but do not remove them. Gasket is easily removed, after all the screws are loosen up. Remove old gasket and replace with new gasket. Start from one corner, slide the gasket in under the frame. Instead of go around to the next corner, go to the opposite diagonal corner. This way, you stretch the gasket out more evenly. After slide the gasket in, from both opposite corners, work around to have the gasket slid in under the frame. Make sure it is stretched out evenly all around before tighten all the screws. Suggest to start tighten the screws, start from the middle out to both corners. High tight is good. Don't want to over tighten you may strip the screw.