Using your UCO candle lantern replacement glass chimney is a breeze. First, find a stable surface to work on. Gently remove the heat shield from the top of the lantern. Take out the old, damaged chimney carefully. Then, insert the new glass chimney in place. Make sure it fits snugly. Put the heat shield back on firmly. When using the lantern, keep it away from flammable materials. Avoid moving the lantern when the candle is lit to prevent the glass from breaking. To maintain your replacement glass chimney, clean it regularly with a soft, dry cloth. If there's stubborn dirt, you can use a mild glass cleaner. But make sure it's completely dry before using it again.