Wooo hoo WHMCS! Thats whet this Knowlegebase is built upon!
Step1 : First, We need to find out which Theme we are using. If you know it already, Move to step 2. You can find this by visiting yourWHMCSinstall.com/admin/ Then Setup GENERAL SETTINGS.
Look beside Template : NAME OF THE TEMPLATE
Step 2: Open your cPanel or FTP and get to that folder. Now open footer.tpl
Step 3: You should see a similar code..
</div>
{$footeroutput}
</body>
</html>
Step 4: Paste your Tracker code or Live Chat code from OwlHQ system right before </body> tag. Like this
</div>
{$footeroutput}
<script type="text/javascript" src="http://owlhq.com/appv3/member/livechat/php/app.php?widget-init.js&uid=2"></script>
</body>
</html>
You are set!