Publisher is not a html code editor, so there is no built-in support for
what you are wanting to do. However, you can Publish to the Web, and direct
your output to a folder on your computer. Then open the index.htm file in
NotePad...or open in IE > View > Source which will also open the page in
NotePad, make your changes and save. Then upload the contents of that folder
to your site.

The problem with editing the code is that each time you make a change to
your page in Publisher, you will have to edit the code again to add your
tags. That might not be very time efficient...

DavidF