Mostly in bloggers you will not find reply button for comment. But if you want to add reply button to blogger comment then just you have to add simple code.
Follow the steps to follow
1. Log in to blogger.
2. Go to Dashboard > Template > Edit HTML
3. Press Ctrl + f to find the below format
<b:include data='comment' name='commentDeleteIcon'/>
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or
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<data:commentPostedByMsg/>
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4.Now paste this code just below above the code
5. Now lets see what is your blog ID?
Click on layout or again in edit html option in the address you can see your blog id.
6. Thats it copy your blog ID and save it.

