Welcome to AA. You will become an expert on this forum very quickly.
A macaw's beak consists of the same material (keratin) that our fingernails do. The beak also continually grows and surface keratin flakes off as the beak grows. Absolutely normal and sometimes their beak looks terrible and other times it looks great. Your bird's beak is normal unless it is cracked.
A bird, any bird, hates a dirty beak and they will rub it until they think it's clean. Again, absolutely normal.
Birds chew wood - that is their job - they do it for fun, to keep their beak in condition and to express the way they are feeling (angry, happy, fun time).
I don't understand what you meant about "confirming email addresses". The forum does not operate on email addresses.