Getting stuck changing to a new theme – am I missing something?

So I’m looking after a site hosted with Bluehost. It uses a very old theme that I want to replace with Twenty Twenty-Three. That theme is installed so I click Activate and a message tells me to go to Jetpack Boost to regenerate my Critical CSS, which I do. I then go to ‘Appearance > Editor’ and create templates. These display as I’d expect in the Templates Editor, so far so good. I go to my existing pages and change their attributes to select the new templates. But when I view the pages they look horrid, as if the CSS is not loading properly. Or at all, really. I click on ‘Caching > Purge this page’, but that doesn’t make a difference. What am I missing?


This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer