To change the Avalanche Enabler Password, You'll need to use the Wavelink Enabler Configuration Utility which is avaialble in the below link. Once you deploy it to the devices with your customized settings(Password, server changes, sync time, shortcuts, backgrounds,etc.,). They will reflect on the devices.
Enabler Download Link : https://www.wavelink.com/Download-Avalanche-Enablers-Software
Guide : http://www.wavelink.com/orders/files/en-ug-53-20120530.pdf