To change the code simply follow this:1. Press the program key, then enter your 5-digit factory code that is on your paper manual.2. Enter the 5 digit user key code of your choice.To delete a code:1. Press the prog key 2. Enter the 5 digit factory code twice.If you wanted to create a code for a temporary user you can follow these directions:To add a user(1):1. Press the program key 2 times2. Enter your 5 digit user code3. Enter the 5 digit user pin of your choiceTo delete the user follow these steps :1. Press the program key 2 times.2. Enter your 5 digit user code.3. Enter 0 0 0 0 0then you are done.