1. Log in to blogger and Go to Design >> Edit HTML
2.Click on "Expand Widget Templates" checked
3. Scroll down and to this code
<b:if cond='data:post.url'>
<a expr:href='data:post.url'> <data:post.title/></a>
<b:else/>
<data:post.title/>
</b:if>
4. now paste this code between <a expr:href='data:post.url'> and <data:post.title/>.
<img src="YOUR-IMAGE-URL" style="border-width: 0px;" />*Replace with YOUR-IMAGE-URL Use correct image URL
5. Now save your template you are done.
