The website uses the “SimpleCorp” theme by Site5. I have the comment/discussion check boxes all clicked.
If I switch the theme to something else, like Twenty Fifteen, all previously entered comments and the ability to Post a comment appears, i.e. the comment textbox & post comment button appears. If I switch back to SimpleCorp, the post comment button and comment textbox, along with all previously entered comments, disappear.
Thanks,
Tricia