thank you for getting back to me.
I read the instructions for the Sharing Add On but I cannot access the post where the sharing add-on shows up. I go to Appearance, Customize, click on the menu link to my posts. The page shows up with my posts displayed. When I try clicking on a post, the display refreshes but I am still on the page, not a post.
I disabled all of my plug-ins, cleared my cache (used a different browser too). Nothing worked except to disable the Hueman add-on. I tried disabling the add-on and then adding it back in again, too. I was really looking forward to using those shortcodes.
I don’t have a lot of plugings: contact7, Huge IT Responsive Slider, Smooth Scroll Page, and TablePress. I added XML Sitemap today, after discovering the problem. Regardless, I disabled them all, opened in a new browser but no success.
Part 2. More experimentation
I made a new page, made that one be the post page. Accessed individual posts in the customizer. Then I activated the Hueman plugin. Could not access individual posts.
So I put a post that only had one category item on my main menu. Then I could bring it up in the customizer, but then still did not have the Single Post Settings option.