Select absolutely any page on your website or blog, open it in the editor (this is important), and at the bottom, select a template from the list, or your own if it's in the template folder. Your page (or blog post) will then have its own separate template.

example: https://downgrade.w10.site/cgi-bin/cms/blog

also the same webpage https://downgrade.w10.site

click on some pages

You can insert the "blog" structure into absolutely any page (text, then a picture under the text, and then the blog structure)