new avast anti-theft user

hello,
I’ve downloaded avast for android on my galaxy mini 2 and i want to enable anti-theft on my phone in stealth mode but before I do this I have a question
what should I do before I enable anti-theft in (stealth mode), like if I inserted a new sim card in my phone and then it asks me for the pin number to stop the anti-theft features (lock - siren mode), say that I forgot the (pin number) what should I do then, and how can I restore it again ?
thank you
PS: My Phone isn’t rooted

You have two ways to get your PIN back (if you forget it): registering a recovery phone number (and get a temporary PIN via SMS) and within the my.avast.com (avast! account). If you do not configure avast! with these two solutions and you forgot the PIN, well, you’ll have to do a factory reset and lost all your data.