Need Help putting linkable logo into wordpress header

I need help placing a logo with a width 475px height 152px into my header.php file and have the logo link back to the home page from any page.

In my header.php file I’ve replaced,

‘<div id=”header”>
<span class=”blogname”>“><?php bloginfo(‘name’); ?></span>
<span class=”blogslogan”><?php bloginfo(‘description’); ?></span>
</div>’

WITH:

‘<div id=”header”>
<img src=”wp-content/repreview.jpg” alt=”header img” />
</div>’

but get only a logo that links to the homepage on the front page. A single ‘post topic’ page just shows the text, header img, but does link back to the homepage as seen here,

https://www.dwazzle.com/ I’m using this site as a sandbox currently to figure this out. I would ideally like to have the logo centered. I’ve been searching for 2 days how to do this after giving up 2 weeks ago. THANKS