Please give Michelle Marovich (copied) access to the about:community blog as an author. I did try adding her myself through the Wordpress admin and it told me that 'The requested user does not exist.' I have added other people through the admin before, so not sure what is different this time.
as requested, i have added Michelle as an author to the about:community blog. you were not able to add her because her account had not yet been added as a subscriber to the core blog. this is something you weren't able to do yourself, so you did the right thing opening this bug :)