reply button in comment

Hello, I’m trying to add a reply button to the comments on my theme, personalized by me.
Actually the theme is working on local on my pc, is not online.

I changed the comment.php and customized the loop with this :

<?php if($comments) : ?>
    <ol class="commentlist">
    <?php foreach($comments as $comment) : ?>
        <li id="comment-<?php comment_ID(); ?>">
        <div class="UserAvatar"><?php echo get_avatar($comment,'50','' ); ?></div>
        <div class="comment-arrow"></div>
              <div class="userSay"><?php comment_author_link(); ?> says :</div>
              <div class="userCommentdate">On <?php comment_date('n-j-Y'); ?> at <?php comment_time(); ?></div>
            <?php if ($comment->comment_approved == '0') : ?>
                <p class="waitingApproval">Your comment is awaiting approval</p>
            <?php endif; ?>
            <p class="comment-text">
            <?php comment_text(); ?>
            </p> 

        </li>
        <div class="comment-bottom"></div>
    <?php endforeach; ?>
    </ol>
<?php else : ?>
    <p>No comments yet</p>
<?php endif; ?>

In the discussion option page I have allowed the thread comments until 5 depth but the link reply still not appear, can you help me to understand whhy?

thanks in advantage-