You can add the easily add reply comment link in wordpress comments template. WordPress api will give you very easy and better options to get reply comment link in wordpress.
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how to get reply comment link in wordpress
Open your comments.php file from your wordpress theme folder and use following code.
<?php // for Text comment_reply_link( array ( 'reply_text' => '<img src="..." alt="Reply Comments">' ) ); // for Image</code> comment_reply_link( array ( 'reply_text' => '<img src="..." alt="Reply Comments">' ) ); ?>
For More detail you can use the following article…