1) Tap on the grey bar at the top middle of the screen
2) Tap Settings
3) Tap Advanced Settings
4) Enter either, Installer(Default 1111), Dealer (Default 2222), or Master Code (Default 1 2 3 4)
5) Tap User Management
Here you can manage all users and codes.
Note: You can only change all codes such as dealer and installer in the panel by going through the Dealer Code.