Hi,
Add the following code in the functions.php file and replace the 5 with your category ID.
add_action( 'pre_get_posts', 'foo_modify_query_show_category' );
function foo_modify_query_show_category( $query ) {
if ( ! is_admin() && $query->is_main_query() && ! $query->get( 'cat' ) )
$query->set( 'cat', '5' );
}
To find cat id, go to WP > Post > Categories > edit category.. You can find the (ex;tag_ID=5) cat ID like this. Use that number in the above code.
Thanks.
