Using the Cateye BM - 45 is a breeze. First, find the right spot on your drop or flat bars to attach the mirror. Simply secure it tightly so it stays in place during your ride. When riding, adjust the mirror to get a clear view of what's behind you. As for maintenance, use a soft cloth to wipe the glass clean. Avoid using harsh chemicals that could damage the aluminium or glass. Also, check the attachment regularly to make sure it's still secure. If you're not using the bike for a long time, it's a good idea to remove the mirror and store it in a safe place.