problem

Because this file
wp-blog-header.php
is not there (or not where it is supposed to be)

no tht i fixed it and for not make a new post i just edit this
but thanks
now i have this problem

1. Don’t mess with the posts. If you got an answer, do NOT change your original post.
2. What you get is a normal blog. What else do you want?

im sorry
i want to get something like this
https://vanilla-moon.unwinded.com/wordpress/

The layout/display/look of the WP blogs is defined by the themes.
admin > Presentation > select a theme.
Adding new themes:
https://codex.www.ads-software.com/Using_Themes#Adding_New_Themes

more than 1,000 free themes:
https://themes.wordpress.net

If you cannot find anything that you like, you need to design, develop your own theme.

ooo ok thanks
now i fix it
thank u!