To alleviate some confusion: You do not need to log in or register to comment on a post or to reply to a comment.
You may do so anonymously. Comments or replies are not usually posted immediately, so check back if you do not see yours right away.
I will not know who you are, either.
I can edit any comments or replies for content before posting, but have not had to do that, yet.
Certain pages do not allow comments.