Some of my old templates were created when Blogger has no comment reply or threaded comment feature. It won't show reply comment button automatically because it have been customized or tweaked. So, you need a few tweak to show this reply comment link or Blogger's threaded comment feature.
I assume that you've applied new Blogger Dashboard. Follow this step "How to add comment reply button on Blogger/Blogspot":
I assume that you've applied new Blogger Dashboard. Follow this step "How to add comment reply button on Blogger/Blogspot":
- Go to Template menu
- Click on Edit HTML button, then HTML frame will appear
- Tick mark on Expand Widget Template to show complete HTML code
- Find this code below
<b:if cond='data:blog.pageType == "item"'>
<b:include data='post' name='comments'/>
</b:if>
- Replace the red code with these code below
<b:if cond='data:post.showThreadedComments'>
<b:include data='post' name='threaded_comments'/>
<b:else/>
<b:include data='post' name='comments'/>
</b:if>
- Click Save Template button