Change my Page-title from h3 to h1 and my Blog-title to h1

My Blog-title is allways H1, even in inner pages (e.g. not the blog homepage). that is bad for SEO.
Now am going to change our blog post title H1 in the  in the inner pages and H2 in the homepage...
Go to Design Tab of you Blog interface and then click the template HTML

 Blog Address:http://bscs-projects.blogspot.com/

I found some solution like this "replace h3 tag with h1 when you find this code:"
<b:if cond='data:post.title'>
<h3 class='post-title entry-title'>
<b:if cond='data:post.link'>
<a expr:href='data:post.link'><data:post.title/></a>
<b:else/>
<b:if cond='data:post.url'>
<a expr:href='data:post.url'><data:post.title/></a>
<b:else/>
<data:post.title/>
</b:if>
</b:if>
</h3>
</b:if>
customize your blog code as it is above code