I see that only members of the Blog are allowed to comment on a post. I cannot find a setting that would allow comments. I am not to sure that allowing unrestricted comments by anybody and everybody would be a good idea either.
So, if you would like to make a comment about a post, send an email to firstname.lastname@example.org with the subject "Comment for the DPARS APRS Blog".
If the comment does not upset the many rules we have to abide by, I will then post the comment on the Blog.