Using this paper towel dispenser is easy. Just load your 300 C-fold or 400 multi-fold towels into the dispenser. When someone needs a towel, they can simply pull one out. Make sure to use the right size towels as specified. As for the tumbler lock, use the key that matches other Bobrick washroom accessories to lock and unlock it. To maintain this dispenser, clean the satin-finish stainless steel body regularly with a mild cleaner. Avoid using abrasive materials that could scratch the surface. Check the wall opening periodically to ensure it's not damaged or loose. If you notice any issues, contact a professional for repair.