Using the MasterLock M176XDLH padlock is a breeze. First, if you want to set your own combination, follow the instructions that come with the lock. Once set, you can easily lock and unlock it by entering the correct combination on the dial. If you forget the combination, don't worry, you can use the back - up key. When using the padlock, make sure to secure it to a stable object. Avoid exposing the lock to extreme weather conditions for long periods, although the covered dials and reinforced body bumper offer some protection. To maintain the lock, keep it clean and dry. If it seems a bit stiff, you can use a small amount of lubricant on the moving parts. Remember, this lock comes with a Lifetime Guarantee, so you can rely on its quality for a long time.