01. Find your Prestashop installation and open its "themes" folder:
02. Open the "footer.tpl" file for editing
03. Scroll to the bottom of the file and find the </body> tag
04. Copy your website code and paste it in before the </body> tag
05. Save your changes, and load up your Prestashop site.
Congratulations! You're now ready to chat with visitors on your Prestashop site!