How do I connect to Adsense Account? I have to add a script section to the head section on the website.  I am modifying the html.html.twig file like this:

&lt;!DOCTYPE html&gt;
&lt;html {{ html_attributes }}&gt;
  &lt;head&gt;
    &lt;script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"&gt;&lt;/script&gt;
    &lt;script&gt;
        (adsbygoogle = window.adsbygoogle || []).push({
            google_ad_client: "ca-pub-6243578269823283",
            enable_page_level_ads: true
        });
    &lt;/script&gt;
    &lt;head-placeholder token="{{ placeholder_token|raw }}"&gt;
    &lt;title&gt;{{ head_title|safe_join(' | ') }}&lt;/title&gt;
    &lt;css-placeholder token="{{ placeholder_token|raw }}"&gt;
    &lt;js-placeholder token="{{ placeholder_token|raw }}"&gt;--
  &lt;/head&gt;
  &lt;body{{ attributes.addClass(body_classes) }}&gt;
    &lt;a href="#main-content" class="visually-hidden focusable skip-link"&gt;
      {{ 'Skip to main content'|t }}
    &lt;/a&gt;
    {{ page_top }}
    {{ page }}
    {{ page_bottom }}
    &lt;js-bottom-placeholder token="{{ placeholder_token|raw }}"&gt;
  &lt;/body&gt;
&lt;/html&gt;`


This seems to not work. Google responded and said I still have to connect my site to Adsense for verification. How do I do this? I have the Adsense module installed but I can't use it until I have an account. This script is for verification so that I can have an account with my website.
Did you already look into dedicated modules for this? There is 

Google AdSense integration and Simple AdSense. The first one is more advanced, the second is simpler, but less flexible. 

For both, you just have to copy over some values, and the module will take carte of the rest.