Hi WebDes2012,
There's actually a way to login with your own password instead of the provided random password:
1) open AirDroid in your mobile phone
2) tap the Settings icon on the upper right corner of the app screen
3) turn on "predefined Passcode"
4) put your own password
*whenever you open AirDroid, it will still provide you a random password, you can just ignore that and enter your own passcode.