For the Disqus issue I went into my account and did notice that the URL was blank, I'm not sure why, maybe I missed it, I don't know, so I ensured it was https://rachelhkay.com, but there still isn't a comment form showing up. Oh and the URL for my Disqus is rachelhkay.disqus.com.
I'll send you a message related to the settings in Pulse issue.
For the related posts issue with AddThis, I contacted them to see if there is anything they can do to help. For the OGP setup in Pulse, I have meta keywords for each blog post, but I'm not entirely sure if I got the setup correct so my posts featured images show up as they should. I wasn't sure if I missed something or not when I setup what shows up on my blog posts on the blog.txt page in Pulse. While I do have the tag for featured image, it is in the blog content loop, and I wasn't sure if I was supposed to place a tag for the featured image elsewhere as well, or if its okay to just have it there. Is there something else I'm supposed to add to my blog posts for the OGP data? I'm honestly not sure if I'm missing something or not since this new Pulse setup is something I'm still learning. Its completely different from Pulse 3.
I did get a response back from AddThis and they said that one of my posts doesn't have the Open Graph image meta tag, so I inspected that page and sure enough, all the other meta tags show up but the image meta tag does not. So I inspected other blog posts and they are the same. The url, type, title, and description og tags show up, but not the image, so there is something I'm missing, but I'm not sure what exactly.