I'm a little confused by your request, but I assume from the link you provided you're just trying to display ascending numbers beside each comment.
The simplest method is to count off comments with your own variable, and use that to display the #. In commments.php (of your theme -- if it doesn't have one, it will use the one for the default theme), look for this bit of code:
<?php foreach ($comments as $comment) : ?>
Just after the foreach, insert your variable with an increment operator:
<?php foreach ($comments as $comment) : $comment_count++; ?>
Then where you want your number to display:
<?php echo $comment_count; ?>