Dear Manny,
Please go to your_site\templates\sj_teen\html\com_k2\templates\default\item_comments_form.php and find:
<label class="formUrl" for="commentURL"><?php echo JText::_('K2_WEBSITE_URL'); ?></label>
<i class="url"></i><input class="inputbox" type="text" name="commentURL" id="commentURL" value="<?php echo JText::_('K2_ENTER_YOUR_SITE_URL'); ?>" onblur="if(this.value=='') this.value='<?php echo JText::_('K2_ENTER_YOUR_SITE_URL'); ?>';" onfocus="if(this.value=='<?php echo JText::_('K2_ENTER_YOUR_SITE_URL'); ?>') this.value='';" />
=>
<?php /*?><label class="formUrl" for="commentURL"><?php echo JText::_('K2_WEBSITE_URL'); ?></label>
<i class="url"></i><input class="inputbox" type="text" name="commentURL" id="commentURL" value="<?php echo JText::_('K2_ENTER_YOUR_SITE_URL'); ?>" onblur="if(this.value=='') this.value='<?php echo JText::_('K2_ENTER_YOUR_SITE_URL'); ?>';" onfocus="if(this.value=='<?php echo JText::_('K2_ENTER_YOUR_SITE_URL'); ?>') this.value='';" /><?php */?>
Thanks!