Have you ever tried one of the default Blogger templates? They have a fully-functioned threaded comments form. However, you won’t see this threaded comments in your own or most of unofficial Blogger templates. In this tutorial, I’ll show you how to enable threaded comments in your unofficial Blogger templates without turning back to official Blogger templates.
Navigate to your Dashboard > Template > Edit HTML. Search for the following code:
<b:if cond='data:blog.pageType == "item"'> <b:include data='post' name='comments'/> </b:if>
Replace it with:
<b:if cond='data:blog.pageType == "static_page"'>
<b:if cond='data:post.showThreadedComments'>
<b:include data='post' name='threaded_comments'/>
<b:else/>
<b:include data='post' name='comments'/>
</b:if>
</b:if>
<b:if cond='data:blog.pageType == "item"'>
<b:if cond='data:post.showThreadedComments'>
<b:include data='post' name='threaded_comments'/>
<b:else/>
<b:include data='post' name='comments'/>
</b:if>
</b:if>
Save your template, and enjoy the discussion on your Blogger blog.