Using the Access Lighting ModPLUS 9-inch Trim is easy. Just install it on your 20831 or 20837 model lighting fixture. When installing, make sure it fits properly and is securely attached. Since the lamp is not included, you'll need to choose a suitable one according to your lighting needs. For maintenance, you can use a soft, dry cloth to wipe the trim regularly to keep it clean. Avoid using abrasive cleaners as they may damage the steel surface. If there are any scratches or damages, contact the retailer for further assistance.