I have a problem with a message from cookies
it does not display after adding to the header include, cookie law also does not show it you can see it?

Can you tell the theme name that you are using ?
Also it is possible your plugin adds variable in theme, can you ask the plugin coder what variables are added ?
Focus Responsive MyBB Theme
headerinclude
Code:
<script type="text/javascript" src="https://URLPAGE/jscripts/whcookies.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta http-equiv="Content-Type" content="text/html; charset={$charset}" />
<meta http-equiv="Content-Script-Type" content="text/javascript" />
<script type="text/javascript" src="{$mybb->asset_url}/jscripts/jquery.js?ver=1813"></script>
<script type="text/javascript" src="{$mybb->asset_url}/jscripts/jquery.plugins.min.js?ver=1813"></script>
<script type="text/javascript" src="{$mybb->asset_url}/jscripts/general.js?ver=1813"></script>
<link href='https://fonts.googleapis.com/css?family=Lobster' rel='stylesheet' type='text/css'>
<link rel="shortcut icon" type="image/png" href="{$mybb->asset_url}//images/focus/favicon.png" />
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" />
{$stylesheets}
<link rel="alternate" type="application/rss+xml" title="{$lang->latest_threads} (RSS 2.0)" href="{$mybb->settings['bburl']}/syndication.php" />
<link rel="alternate" type="application/atom+xml" title="{$lang->latest_threads} (Atom 1.0)" href="{$mybb->settings['bburl']}/syndication.php?type=atom1.0" />
<script type="text/javascript">
<!--
lang.unknown_error = "{$lang->unknown_error}";
lang.select2_match = "{$lang->select2_match}";
lang.select2_matches = "{$lang->select2_matches}";
lang.select2_nomatches = "{$lang->select2_nomatches}";
lang.select2_inputtooshort_single = "{$lang->select2_inputtooshort_single}";
lang.select2_inputtooshort_plural = "{$lang->select2_inputtooshort_plural}";
lang.select2_inputtoolong_single = "{$lang->select2_inputtoolong_single}";
lang.select2_inputtoolong_plural = "{$lang->select2_inputtoolong_plural}";
lang.select2_selectiontoobig_single = "{$lang->select2_selectiontoobig_single}";
lang.select2_selectiontoobig_plural = "{$lang->select2_selectiontoobig_plural}";
lang.select2_loadmore = "{$lang->select2_loadmore}";
lang.select2_searching = "{$lang->select2_searching}";
var cookieDomain = "{$mybb->settings['cookiedomain']}";
var cookiePath = "{$mybb->settings['cookiepath']}";
var cookiePrefix = "{$mybb->settings['cookieprefix']}";
var cookieSecureFlag = "{$mybb->settings['cookiesecureflag']}";
var deleteevent_confirm = "{$lang->deleteevent_confirm}";
var removeattach_confirm = "{$lang->removeattach_confirm}";
var loading_text = '{$lang->ajax_loading}';
var saving_changes = '{$lang->saving_changes}';
var use_xmlhttprequest = "{$mybb->settings['use_xmlhttprequest']}";
var my_post_key = "{$mybb->post_code}";
var rootpath = "{$mybb->settings['bburl']}";
var imagepath = "{$theme['imgdir']}";
var yes_confirm = "{$lang->yes}";
var no_confirm = "{$lang->no}";
var MyBBEditor = null;
var spinner_image = "{$theme['imgdir']}/spinner.gif";
var spinner = "<img src='" + spinner_image +"' alt='' />";
var modal_zindex = 9999;
// -->
</script>
<script type="text/javascript">
$(function(){
var shrinkHeader = 160;
$(window).scroll(function() {
var scroll = getCurrentScroll();
if ( scroll >= shrinkHeader ) {
$('.header').addClass('shrink');
}
else {
$('.header').removeClass('shrink');
}
});
function getCurrentScroll() {
return window.pageYOffset || document.documentElement.scrollTop;
}
});
</script>