Comments-Box not displaying on “Posts”

Greetings.

I am having trouble configuring my site such that: “Comments” is enable for each and every PAGE and POST.

The comments-form is working fine for all PAGES.

But, it is not showing for my POSTS.

I have a default page which displays when I open my site. This page holds every article which is posted to the site, by default.

I deleted, and then re-installed the Comments plug-in which WP offered as a solution. However, this did nothing.

I have tried manually enabling comments every which way. Still, nothing. Screen-Options, Settings, Discussions, etc. etc. Nothing works.

I de-activated, and then re-activated all plug-ins. I didn’t expect this to solve the problem anyway, but I decided I had nothing to lose by trying. Didn’t work.

I found an online post which referred to modifying “Settings” under the “Theme Options” menu. But, seeing as the Theme Options is missing from my WordPress Menu, I am at a loss as to how this could be of any help.