IMPORTANT: Editing of the HEAD section should be done by experienced users.
The HEAD element contains general information, also called meta-information, about a document.
According to the HTML standard, only a few tags are legal inside the HEAD section. These are: <base>, <link>, <meta>, <title>, <style>, and <script>.
In the PowaWEB control panel there is one dialog window where such content can be added to the site. It is Edit Webmaster Verification in the Website screen.
styles go here
script goes here
To add meta tags please see the related KB article: How to verify your site using Webmaster Verification services?
To add a favicon please see the related KB article: How to add a Favicon to your site