If you wish to post a comment, look at the end of the latest posting. You will see the word "Comments" or something similar, along with the image of a pencil. Click on those words and a page that looks the same will come up, but with all the other comments that have been made (if any). When finished writing your comment, you can click on "Preview" to see what it's going to look like, or you can click on "Post" or "Publish" if you are satisfied with it. Be patient, it takes a little time for the computer to post it.
If you have trouble, send me an email, and I'll try to help from my end.