Default theme- how to show where you click to from clickable header? add logo?

I followed the method offered by the Theme’s author to make the entire WordPress Default/Kubrick Theme header clickable:
? Open header.php template file.
* Change from <div id=”header”> to:
<div id=”header” onclick=”location.href=’https://www.peteranne.it/&#8217;;” style=”cursor: pointer;”>

see blog https://www.peteranne.it/wp/

However, when you hover the mouse pointer over the header, you don’t see https://www.peteranne.it which is what I want to link to and what I want people to see they are clicking through to…how do I edit the header.php to do this?

I also want to add a little logo as shown in https://www.peteranne.it/wp/?p=88 but without replacing the main header area which is fine for me…how do I do this?

thnaks Peter