How to show child categories and to put Search near logo

need to use custom menu->location->primary.

@search near logo
add this to child theme functions.php or wp-content/meso-custom-functions.php

<?php
function meso_add_custom_searchform() {
return get_search_form();
}
add_action('bp_inside_header','meso_add_custom_searchform',20);

function meso_add_custom_searchform_css() {
echo '<style>'; ?>
#header .search-form {width: 400px;float: left;margin: 30px 0 0 100px;}
#header .search-form .screen-reader-text {display:none;}
<?php echo '</style>';
}
add_action('wp_head','meso_add_custom_searchform_css');
?>

Hello. I am sorry. But I could not fix any this problem. ?t does not work.

working fine in my end tho.