Using the ASI 0042 toilet paper dispenser is a breeze. First, open the door with the provided key. If you're using rolls with a 2 - 1/4 inches diameter inner core, you can directly place the roll inside. For rolls with a 1 - 5/8 inches diameter core, remove the 'O' ring adapter from the interior before inserting the roll. After that, close the door and lock it to prevent theft. Keep an eye on the remaining tissue through the viewing slot. When it's time to replace the roll, just repeat the process. As for maintenance, regularly wipe the dispenser with a soft cloth to keep its satin finish looking good. Avoid using abrasive cleaners as they might scratch the stainless steel. Also, check the lock periodically to make sure it's working properly.