Here is instruction on how to use Hitsteps on Zencart platform:

1. Sign up for a Hitsteps account.
2. If you already have an account, login to your account.
3. Add your website name to Hitsteps and you will be given an Hitsteps API Code
4. If you already added your website, Open My Sites page and click on Setting button of your website name.
5. Copy Hitsteps Tracking Code, not api code ( highlight code using mouse left click and then press Ctrl+C )
6. Log into your Zencart source code editor (either FTP or other plugins).
7. Find your template footer file which should be located in a folder with following structure: includes/templates/custom/common/tpl_footer.php
8. Take a backup of this file just in case
9. Scroll down to end of the file and you will find </body>
10. Paste Hitsteps tracking code which you copied earlier before that </body>
11. Save the changes/upload edited template file.
12. Enjoy!