Menu Links not working

Hello WP members, Seek your assistance in getting my blog running…

Clicking on new post goes to this link – https://domain.com/blog/wp-admin/post-new.php/

Media link goes to – https://domain.com/blog/wp-admin/media-new.php/

Link to – https://domain.com/blog/wp-admin/link-add.php/

Site admin to – https://domain.com/blog/wp-admin/

But landing pages are all ” Hello World”…Please help!