Struggling with WordPress

Very hard to add a simple blog to an existing non-Wordpress website.  I just want https://www.dataperceptions.co.uk/blog to point to my blog page, not to a whole new website home page.

Any time I try to tweak the theme it reverts to giving me a home page etc..  I DON’T WANT THAT!

This is really just a test page and I hope no one reads it, as I’m so ashamed of not being able to tame WordPress.  FWIW, I am the developer of Prophecy, which is written in C++ and I implemented the main Data Perceptions website.  So I feel entitled to think I ought to be able to bend WordPress!