1) I has added to the site a search bar from Google Adsense. Google offers the opportunity to use this scale only for searching the site. In order to do this, I need to insert the code that Adsense gives to the Search page. However, I can not open it. Is it possible to do?

2) I added on the site the Adsense code for mobile devices according to the following instructions:

Place this ad code in the tag (or at the top of the ) of the pages where you want to show the ads. It’s the same ad code for every page and site, and you won’t need to change it even if you adjust your page-level ads settings.

https://support.google.com/adsense/answer/6245307?hl=en-GB&utm_source=aso&utm_medium=link&utm_campaign=ww-ww-et-asfe_

I have placed it in the beginning of the (see  the attachment)/ However, the relult is zero. Adsense writes:

This page cannot display anchor ads for the following reason

1/ The viewport is not between 320 and 420 pixels wide,

2/ Either your browser current zoom is not neutral or this page,s layout is not mobile-optimized".

Did I insert the code correctly?

To tell the trouh I did not optimize the site.Because I failed to do this. However, the browser Chrom independently optimizes it very well and adapts any page. Perhaps because of this advertising is not shown?