Using this toilet tissue dispenser is easy. Just unlock it with the provided key, remove the existing empty rolls if any, and insert two new rolls of toilet tissue with a diameter of up to 5 1/8 inches. Close the dispenser and lock it again to prevent theft. When it comes to installation, since it's surface-mounted, you can easily attach it to the wall following the included instructions. For maintenance, regularly check the tumbler lock to ensure it's working properly. If the dispenser gets dirty, you can wipe it with a soft, damp cloth. Avoid using abrasive cleaners as they may damage the matte black finish. If you need to change the mounting style, you can remove the skirt in the field for recessed mounting.