There is a forgot password link at the bottom of the login screen. Use that option and we will email you the password.
Stealth mode works on most of the devices but on certain devices it does not work. Try restarting you device once and dial the code using the dialer. If it still does not work uninstall and the app and reinstall it from play store you will get the app icon back. Not to worry your old data will still be there.