Change the title to an img.

I’m not sure what you mean. By “page title”, are you referring to:

- the <title> tag?
– the title of a post?
– the header image at the top of the blog?

You’ll need to edit your theme to do that. Go to your dashboard > Presentation > Theme Editor > Then over on the right a list of files will show up click on Header.php or header. I’m not exactly show which one it is without seeing. Then you’ll need to look for some code pretty close to the top which looks similar to this:

<div id="title">
			<h1>
<a href="<?php bloginfo('url'); ?>"><?php bloginfo('name'); ?></a>
			</h1>
			<div class="description">
				<small></small>
			</div>
		</div>

You’ll want to replace the
<a href="<?php bloginfo('url'); ?>"><?php bloginfo('name'); ?></a>
With
<a href="<?php bloginfo('url'); ?>"><img src="http://theaddress/of/the/image.jpg" alt="Logo"/></a>
This will see allow the logo to be clickable and be a link back to the home page.