Using your Kryptonite U-Lock is easy. First, find a secure object like a bike rack to lock your bike to. Open the lock by inserting one of the stainless steel keys and turning it. Place the U-shaped shackle around the bike frame and the secure object, then close the lock by inserting the shackle into the lock body and turning the key again to lock it. When using the FlexFrame - U bracket, you can attach the lock to different parts of your bike for easy carrying. Keep the lock dry and clean. If it gets dirty, you can use a soft cloth to wipe it. Avoid using abrasive cleaners as they may damage the protective vinyl coating. Also, don't expose the lock to extreme temperatures for long periods. If you ever misplace your keys, remember you can use the Key Safe Program to get a replacement.