Missing SEO Settings For Everything. Why?

Site URL: https://www.solidsafesandlocks.com/

For normal pages, I'd go to the gear / wheel -> SEO and write my optimized page title / description but for this website, it doesn't look like his pages are actual pages in the eyes of Squarespace.

When I click on the gear/wheel, there's just 2 things in there:  link title and link URL.  Does this mean it's just a link pointing to a page that was built on another squarespace account or a different CMS altogether even?  

This website is just category "pages" (which have no SEO settings) and a list of products on those "pages".

How can I gain access to the page title / description for all of these category pages on the site such as this one.

Also, for the category pages which only have 2 options (link title / link URL), when I test it out by changing and optimizing the link URL, it just goes to a dead page after that... the previous URL and the new URL don't work.

Thanks.

I have the same thing going on with a site that I'm working on. Did you find the answer? 

These are links to pages versus the actual pages. Look for the pages in the Not Linked section.