Hello
From the frontend of this blog page, I guess the template style you're assigning to this menu item doesn't include the component
block - the main block which displays main content of a page.
There are 2 approaches here: Backend >> Site template styles >> JA Purity IV >> layout settings
1/ Switch the current layout to default
layout
2/ Edit the current layout by adding a new section + load the component block there as my above printscreen.
Hope this helps.