How to add custom HTML to your Joomla site
Log into Joomla admin panel.
Click on Extensions – Module manager. Scroll right and click on New button.
Select Custom HTML option. Scroll right and click on Next button. Enter details. Click on HTML icon and enter HTML code in the text box. Click on update button, when done. Enter suffix for CSS class. Click on Save button, when done.
Custom HTML will appear on front-end. HTML code will appear.