Edit: Problem solved. The confirmation e-mail had to be done.

I received word (see below) from someone who's struggling to comment. Any ideas?

Hi, sorry to bother you. I'm a new user and cannot for the life of me figure out how to comment on a thread (for instance, the welcome thread you posted). I've read the faq which says there should be a comment box below the text of each article but I don't see that. I also don't see the "Reply" button on any comments.

I'd normally try to handle this on my own, but I've already spent an hour or two reading through the wiki for help and haven't come up with much, and it felt silly to continue doing that without checking with someone first.

Can you advise me on this, or refer me to someone who can? Thanks.

and

I've tried logging in from several devices/browsers, to no avail.