The system has 2 passwords that you can configure. System Password and User Password. You can find this under Menu > Settings > Password. Also keep in mind that through the SmartLife App you can share the system with multiple users. This will give them access to Arm/Disarm the system as well. You can also remove these user(s) at anytime.
What is the Difference between System Password & User Password: Click Here
NOTE: Whoever you decide to share the system with, will have to setup an account on the SmartLife app as well.