You can check all active and inactive users from Dashboard > wpForo > Members, Status Column.

wpForo doesn't handle the emails, just has several templates which users get after x action.

I have 3 questions please: 

1. How can a moderator or an administrator to see which users activated their account?

2. Can a moderator or an administrator send a reminding email to the users that did not activated their account?

3. Can a mass email or individual email be send to the users so that they choose to receive notifications based on the 2 choices shown in the attached image?

Thank you so much in advance!