Hello,

you can configure your avast! PIN in Mobile Security or Anti-Theft. if you are asked for a avast! PIN but u are sure u didn’t set one, try the default 0000

you won’t be able to use the online account since amazon devices are stripped of all google cloud to device messaging services.
but - since you can’t manage to connect to the online account it’s not /that/ bad. In case of emergency - when the phone gets lost - I would recommend using SMS commands anyway. They are much more reliable and work even without internet access.

SMS commands and how to use them are explained in our manual:
http://files.avast.com/files/documentation/mobile-security-user-guide-en.pdf
give it a try - it’s short and easy to understand.

regards,
Werner